WO2003053675A1

WO2003053675A1 - Noise-absorbing and water-intercepting mat

Info

Publication number: WO2003053675A1
Application number: PCT/JP2001/011204
Authority: WO
Inventors: Masayuki Mori; Hitoshi Matsuyama; Kazuo Nakata; Kinya Fujita
Original assignee: Meisei & Company, Ltd.; Eidai Kako Co., Ltd.
Priority date: 2001-12-20
Filing date: 2001-12-20
Publication date: 2003-07-03
Also published as: AU2002225348A1; JP3727308B2; JPWO2003053675A1

Abstract

A noise-absorbing and water-intercepting mat (1) which comprises a water-intercepting layer (2) comprising a polymer film having a number of pores formed therein and, bound on the upper surface thereof via an air-permeable adhesive layer (5) formed by heating and melting a thermoplastic resin powder, a surface skin material layer (3), and, bound on the under surface of the water-intercepting layer (2), a noise-absorbing layer (4) via an air-permeable adhesive layer (6) formed by heating and melting a thermoplastic resin powder. The mat combines excellent noise-absorbing property and satisfactory water-intercepting property, and thus can be suitably used particularly as a floor mat for an automobile.

Description

Description Sound-absorbing mat Technical Field ''

The present invention relates to a sound-absorbing and water-insulating mat suitable for use as an automobile floor mat. Background art

Conventionally, floor mats for automobiles have a structure in which a backing layer made of a soft resin material is laminated and integrated on the back side of a skin material such as a power base material with piles planted on the front side. However, in recent years, a structure in which a nonwoven fabric is bonded to the back side of the skin material is often used because the structure is heavy and almost no sound absorbing effect is obtained. Has become. In this configuration, a nonwoven fabric is used, so that the weight can be reduced, and noise such as noise is absorbed when passing through the nonwoven fabric layer, so that the mat has a sound absorbing effect.

However, in the configuration in which the nonwoven fabric is simply attached to the back side of the skin material as described above, the mat does not have water-blocking properties, and water adheres to the surface of the floor mat through wet shoes or umbrellas during rainfall, for example. Then, there is a concern that this water will pass through the floor mat and reach the back side, causing the metal plates that make up the floor to become uneven, and the carpet will be pasted on the car floor in advance. If constructed, there is a concern that the constituent fibers of the carpet may be corroded. In order to further provide the mat with a water-blocking function, for example, a configuration in which a water-blocking sheet is interposed and integrated between the skin material and the nonwoven fabric sound-absorbing layer can be considered. Noise that enters the vehicle from the floor side of the vehicle can be absorbed by the lower non-woven fabric layer, The noise that enters the cabin through the doors, doors, etc., is repelled into the cabin by the waterproof sheet of the mat, causing a problem that the noise level is raised by being echoed in the cabin without being absorbed. In other words, from the viewpoint of ensuring excellent sound absorbing performance, the noise on the upper side (the noise entering the vehicle interior) must also reach the sound absorbing layer, and for this purpose, the mat has air permeability. However, in order to ensure that the mat has waterproofness, it is necessary to prevent the passage of water by interposing a waterproof sheet, etc. In the past, it was not possible to achieve both excellent sound absorption and water-blocking properties on mats such as floor mats for automobiles, because they had to have both properties (air permeability and water-blocking properties). It is.

The present invention has been made in view of such a technical background, and an object of the present invention is to provide a sound-absorbing and water-insulating mat having excellent sound-absorbing properties and sufficient water-insulation.

Other objects of the present invention will be made clear by the following embodiments of the present invention. Disclosure of the invention

In order to achieve the above object, the present inventors have conducted intensive studies and found that by interposing a polymer film layer having a large number of air bubbles formed between the skin material layer and the sound absorbing layer, the present invention is superior. As a result, they have found that it is possible to achieve both sound absorption and water shielding, and have completed the present invention.

That is, the sound-absorbing water-insulating mat according to the present invention comprises a skin material layer joined to an upper surface of a water-insulating layer made of a polymer film, and a sound-absorbing layer joined to a lower surface of the water-insulating layer. Is characterized in that a number of bubbles are formed therein.

Further, another sound-absorbing water-insulating mat of the present invention includes a water-absorbing layer made of a polymer film, and an air-permeable adhesive layer formed by heating and melting a thermoplastic resin powder. While the skin material layer is joined, a sound absorbing layer is joined to the lower surface of the water barrier layer via a gas-permeable adhesive layer formed by heating and melting a thermoplastic resin powder. In which a large number of bubbles are formed.

In any of the above inventions, since the water-blocking layer made of a polymer film is provided, water entering from the surface of the mat is not blocked by the water-blocking layer and reaches the back side of the mat. Also, it goes without saying that noise from the lower side of the mat is absorbed by the lower sound absorbing layer, but in the present invention, a large number of air bubbles are formed in the polymer film for water shielding. As a result, sound is sufficiently transmitted from one side of the polymer film to the other side, so that noise above the mat (for example, noise that enters the vehicle interior from a door or the like) is covered by a skin material, a polymer, or the like. Since the sound reaches the lower sound absorbing layer via the film and is absorbed by the sound absorbing layer, sufficient silence is ensured in the space where the mat is laid (for example, in a vehicle interior). As described above, in the present invention, it is particularly technically important that the polymer film layer in which a number of bubbles are formed enables formation of a layer having both sound permeability and water shielding. This made it possible for Matsuto to achieve both excellent sound absorption and water shielding. As described above, it was conventionally thought that air permeability was required to allow sound to pass through. In contrast, the present invention provides a polymer film layer in which a number of air bubbles are formed. It is particularly important that the use of a layer enables the formation of a layer that provides sufficient sound permeability even without air permeability. '

Further, in the latter invention, the skin material layer and the water-blocking layer, and the water-blocking layer and the sound-absorbing layer are respectively bonded via a gas-permeable adhesive layer formed by heating and melting the thermoplastic resin paddle. As a result, sufficient bonding strength can be ensured while providing good air permeability as the adhesive layer, and a more durable sound absorbing and water-insulating mat can be provided. Further, an air layer is formed in the air-permeable adhesive layer, and a sound absorbing effect is exerted by the air layer, so that the sound absorbing property of the mat is further improved.

In the present invention, the thickness of the polymer film constituting the water-blocking layer is 30 to 120 μm. set to m; ^ preferred. As a result, it is possible to further improve the sound absorption while ensuring the water shielding.

The hardness of the polymer film constituting the water-blocking layer is preferably from 75 to 100. When the hardness is set in such a range, the sound permeability of the film is further improved, so that the sound absorbing performance of the mat can be further improved.

The ratio of the volume occupied by the bubbles to the apparent volume of the polymer film is preferably 50 to 90%. When the occupied volume ratio of the bubbles is set in such a range, the sound absorption can be further improved while ensuring the water shielding.

In the present invention, the method for forming the bubbles is not particularly limited, but the bubbles are preferably formed by thermal expansion of the thermally expandable microcapsules. The thermal expansion micro-force capsule has an outer shell, so that the bubbles formed by the thermal expansion of the micro-force capsule are independent of each other (the bubbles do not communicate with each other) and the film Since the occurrence of pinholes on the surface can also be prevented, sufficient strength can be provided as the polymer film constituting the water barrier layer. In addition, the bubbles formed by the thermal expansion of the microcapsules are mutually independent, so that the size (outer diameter) of the obtained bubbles can be controlled to be uniform, thereby achieving a desired size. Since sound transmission is ensured, a high-quality sound absorbing and insulating mat can be constructed.

The polymer film constituting the water-blocking layer is preferably a polyolefin-based film. In this case, the cost can be reduced, and there is an advantage that the recycled film can be easily used after use.

Further, the sound absorbing layer is preferably made of a nonwoven fabric. As a result, the weight of the mat can be reduced, and the cushioning life of the mat can be improved. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a sound-absorbing and water-insulating mat according to an embodiment of the present invention. 2A and 2B are schematic sectional views of a polymer film.

FIG. 3 is a side view schematically showing a manufacturing method, in which FIG. 3A shows a first step and FIG. 3B shows a second step.

FIG. 4 is a graph showing an example of the sound absorbing characteristics of the sound absorbing and water insulating mat of the present invention in comparison with that of a conventional sound absorbing mat. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 shows a sound absorbing and water-insulating mat (1) according to an embodiment of the present invention. In the waterproofing mat (1), a skin material layer (3) is joined to the upper surface of a waterproofing layer (2) made of a polymer film via a breathable adhesive layer (5), and the waterproofing layer (2) A sound-absorbing layer (4) is bonded to the lower surface of the polymer film via a gas-permeable adhesive layer (6), and a number of air bubbles (10) are formed in the polymer film (2). See figure). Each of the air-permeable adhesive layers (5) and (6) is formed by heating and melting a thermoplastic resin powder.

Since the mat (1) is provided with a water-blocking layer (2) made of a polymer film, sufficient water-blocking properties can be obtained as a mat, and water does not reach the back surface from the mat surface. It is possible to prevent the generation of 鲭 on the metal plate that constitutes the floor of the automobile, and it is also possible to prevent the corrosion of fiber fabrics such as power pipes attached to the lower side.

In addition, noise from the lower side of the mat (1) is absorbed by the sound absorbing layer (4) arranged on the lower side. Furthermore, since a large number of bubbles are formed in the polymer film (2), sound is sufficiently transmitted from one side of the polymer film (2) to the other side, and the mat (1) The upper noise (for example, noise entering the vehicle interior from doors, windows, bodies, etc.) is transmitted through the skin material layer (3) and the water-absorbing layer (2) made of a polymer film to the lower sound-absorbing layer (4). ), And is absorbed by the sound absorbing layer (4). Therefore, the sound is absorbed in the space where the mat (1) is laid (for example, in a vehicle). Quiet quietness is secured. The mechanism by which sound propagates through the polymer film (2), in which a number of bubbles (10) are formed, is not clear, but mainly the portion of the bubble (10) in the polymer film (2) It is presumed that the sound is propagating to the opposite side via (see Fig. 2). That is, the sound permeability of the film (2) is not obtained by the air permeability of the film. '

In addition, as shown in Fig. 4, in the sound absorption characteristic graph in which frequency is plotted on the horizontal axis and sound absorption rate is plotted on the vertical axis, the sound absorption curve of a conventional sound absorption mat rises to the right (indicated by the dotted line in the figure). However, the sound absorption coefficient did not increase from the region of 1500 to 2000 Hz and was almost level, whereas the mat (1) of the present invention had a polymer in which many bubbles were formed. Since the film layer (2) is used as the intermediate layer, the sound absorption curve rises to the right (indicated by the solid line in the figure). The force S also rises to the right in the range of 1500 to 2000 Hz and in the higher frequency range. In addition, the mat (1) of the present invention has an advantage that it can exhibit excellent sound absorbing properties in a wide frequency range.

Furthermore, a breathable adhesive layer (5) that joins the skin material layer (3) and the water-blocking layer (2), and a breathable adhesive layer (6) that joins the water-blocking layer (2) and the sound-absorbing layer (4) Both are formed by heating and melting a thermoplastic resin pad, so that an adhesive layer with good air permeability (5) and (6) is formed to prevent the passage of sound. In addition to being able to form, there is an advantage that a sufficient adhesive strength can be secured and the durability as the mat (1) can be further improved. Further, since the air layer portion is present in the air-permeable adhesive layers (5) and (6), there is an advantage that the sound absorbing effect is increased by the air layer.

In the above embodiment, the skin material layer (3) and the water barrier layer (2) are joined via the air-permeable adhesive layer (5). However, the skin material layer (3) and the water barrier layer (2) are joined together. 2) A configuration in which and are directly laminated and integrated may be adopted. Similarly, a configuration in which the water shielding layer (2) and the sound absorbing layer (4) are directly laminated and integrated may be employed.

The cross-sectional shape of the polymer film (2) is, for example, as shown in Fig. 2A. The diameter of (10) may be smaller than the thickness (T) of the film (2) and the surface of the film may be smooth, or the diameter of the bubble (10) as shown in FIG. 2B. May be larger than the thickness (T) of the film (2), and the bulging portion caused by the air bubbles (10) may protrude from the surface of the film (2).

In the present invention, the polymer film constituting the water barrier layer (2) is not particularly limited, but may be, for example, polyethylene, polypropylene, polyester, EVA (ethylene vinyl acetate resin), thermoplastic elastomer, or the like. The thermoplastic resin film is used. Among these thermoplastic resin films, it is preferable to use a polyolefin-based film such as polyethylene or polypropylene, which can reduce costs and facilitate recycling after use. Examples of the polyethylene include low-density polyethylene and meta-mouth polyethylene.

It is preferable that the thickness (T) of the polymer film constituting the water barrier layer (2) is 30 to 120 μηι. If it is less than 30 m, it is not preferable because the film strength is reduced and it is difficult to maintain water-blocking 5 reliably. On the other hand, if it exceeds 120 μπι, the sound permeability of the water-blocking layer (2) decreases and the sound absorbing mat (1) It is not preferable because the sound absorption performance as a whole decreases.

It is preferable that the hardness of the polymer film constituting the water barrier layer (2) is 75 to 100. If it is less than 75, it is not preferable because tearing is likely to occur during molding and use, and if it is more than 100, the sound permeability of the water-insulating layer (2) decreases and the sound absorbing performance as the sound absorbing mat (1) decreases. It is not preferable. Above all, the hardness of the polymer film constituting the water shielding layer (2) is more preferably 80 to 95. The “hardness” is a hardness measured by the durometer hardness test method of JIS K6253-1997.

5 The ratio of the occupied volume of the bubble (10) to the apparent volume of the polymer film (2) is preferably set to 50 to 90%. Less than 50% of the film (2) It is not preferable because sound permeability cannot be sufficiently obtained and the sound absorbing performance of the mat (1) is reduced. On the other hand, if it exceeds 90%, the strength of the polymer film (2) is lowered, and it is difficult to reliably maintain the water shielding property, which is not preferable. In particular, the ratio of the volume occupied by the bubbles (10) to the apparent volume of the polymer film (2) is more preferably set to 65 to 80%.

In the present invention, the method of forming the bubbles (10) formed in the polymer film (2) is not particularly limited, but is preferably formed by thermal expansion of the thermally expandable microcapsules. The heat-expandable microcapsules are obtained by encapsulating a volatile liquid in an outer shell (1 1) made of a thermoplastic resin. Expands as the volatile liquid enclosed in the vaporizer expands. As shown in FIG. 2, the bubbles (10) formed by the thermal expansion of the microcapsules are surrounded by an outer shell (11) as shown in FIG. ) ... are independent of each other (bubbles do not communicate with each other) and can prevent pinholes due to bubbles on the film surface, so the polymer film constituting the water-blocking layer (2) Thus, a sound-absorbing and water-insulating mat (1) having excellent water-proof durability can be provided. In addition, the bubbles (10) formed by the thermal expansion of the microcapsules are independent of each other, that is, they do not communicate with each other. (Outer diameter) can be strictly controlled, and bubbles (10) of uniform size can be formed in the polymer film (2), so that the desired sound permeability can be obtained reliably. A high-quality sound-absorbent water-proof mat (1) can be constructed. The thermoplastic resin constituting the outer shell (11) of the heat-expandable microcapsule is not particularly limited, and examples thereof include vinylidene chloride and atarilonitrile copolymer.

The volatile liquid encapsulated in the shell (11) of the heat-expandable microcapsules is a liquid at room temperature and is vaporized by heating during film formation. Any substance can be used as long as it is not particularly limited. Examples thereof include hydrocarbons such as isobutane, isopentane, n-butane, n-pentane, neopentane, and hexane.

Examples of commercially available products of the heat-expandable microcapsules include, for example, etapancell (trade name: manufactured by Nippon Philite Co., Ltd.).

Thus, the polymer film (2) in which a large number of bubbles (10) are formed by the thermal expansion of the thermally expandable microcapsules can be produced, for example, as follows. That is, heat-expandable microcapsules are blended with a resin such as polyethylene for forming the film (2), and the resultant is extruded into a film by a T-die method and a fine-flow method. The microcapsules expand due to heating during extrusion molding, and bubbles (10) are formed in the polymer film (2).

In the present invention, the skin material layer (3) is not particularly limited, and examples thereof include a material in which a pile is planted on a base fabric, a needle-punched nonwoven fabric, and the like. In the case of the former configuration, latex for preventing pile removal may be applied to the back surface of the base fabric. The type of fiber constituting the skin material layer (3) is not particularly limited, and examples thereof include polypropylene fiber, polyester fiber, nylon fiber, and acrylic fiber.

The sound-absorbing layer (4) is not particularly limited. For example, a non-woven fabric such as an idle punched non-woven fabric or a spun-pound non-woven fabric is used because sufficient sound absorbing performance can be obtained while ensuring light weight. Preferred. The type of fibers constituting the nonwoven fabric is not particularly limited, and examples thereof include polypropylene fibers, polyester fibers, nylon fibers, and acrylic fibers. From the viewpoint of ensuring a sufficient sound absorbing performance, the thickness of the nonwoven fabric and. 3 to 30 mm, and a basis weight of the nonwoven fabric 20 0: to set the looo gZ m ^2, preferably. .

In the present invention, the type of resin of the thermoplastic resin powder used for forming the air-permeable adhesive layers (5) and (6) is not particularly limited as long as it is a thermoplastic resin. Polyolefin-based resins such as ethylene, polypropylene, and ethylene-vinyl acetate copolymer resin (EVA resin). Above all, it is preferable to use a polyolefin-based resin padder, whereby the recyclability can be improved. Particularly preferred is EVA resin powder. In this case, there is an advantage that the adhesive strength can be further improved. '

The thermoplastic resin powder preferably has a particle size of 20 to 500 / im. If it exceeds 500 / m, it is difficult to obtain good air permeability as the air-permeable adhesive layer (5) (6), which is not preferable. On the other hand, if the thickness is less than 20 μm, the cost required for miniaturization to such a high level is high, and the powder tends to flutter during the production, which lowers the workability of the production.

The sound absorbing and water insulating mat (1) of the present invention can be manufactured, for example, as follows. First, as shown in FIG. 3A, a certain amount of the thermoplastic resin powder is transferred from the spraying device (20) onto the nonwoven fabric (4) while the nonwoven fabric (4) is conveyed at a constant speed with the bonding surface thereof facing upward. After continuously spraying, the thermoplastic resin powder is heated and melted by using a heating device (21), and then a polymer film (2) having a large number of air bubbles formed therein is overlaid thereon and heated. By pressing these with rolls (22) and (22), the sound-absorbing layer (4) made of nonwoven fabric and the sound-insulating layer (2) made of polymer film are joined via the air-permeable adhesive layer (6). The semi-finished sheet (30) is manufactured in a continuous process. The semi-finished product sheet (30) is wound into a roll and used as a material in the next second step.

Next, as shown in Fig. 3B, while the skin material (3) is conveyed at a constant speed with the joint surface thereof facing upward, a thermoplastic resin is spread on the skin material (3) from the spraying device (20). After continuously dispersing a certain amount of the powder, the thermoplastic resin powder is heated and melted by using a heating device (21), and then the semi-finished product sheet (30) is formed thereon by a polymer film. The sound insulation layer (2) is overlapped so as to be an intermediate layer, and these are joined by pressing them with a heating roll (22) (22), and the product shown in FIG. Manufactures a sound absorbing and water-insulating mat (1) with a layer structure.

The sound-absorbing and water-insulating mat (1) of the present invention is not particularly limited to the one manufactured by the above manufacturing method. .

The sound absorbing and water-insulating mat (1) of the present invention is suitably used as an automobile floor mat, but is not particularly limited to such an application.

Next, specific examples of the present invention will be described.

Skin material A: Tufted carpet (woven polyester fiber woven fabric with tufted pile yarn of nylon fiber)

Thermoplastic resin powder A: EVA powder (melt acetate content 28% by weight, melt flow rate 400, melting point 80.C)

Non-woven fabric A (sound absorbing layer): Needle punched non-woven fabric (polyester fiber, thickness 6 mm, basis weight 400 g / m ² )

Polymer film A (water barrier layer): film thickness 60 ^ ηι, film hardness 90, bubble occupancy 75%, film resin is low-density polyethylene (LLDPE), heat-expandable micro for foam formation The capsule used was “Etaspancel 092 R” (volatile liquid: isoptan, outer shell: acryloetryl-metatarilonitrile copolymer), and the cross-sectional shape was as shown in FIG. 2B.

Example 1

As shown in FIG. 3A, while the nonwoven fabric A (4) is being conveyed at a constant speed, the thermoplastic resin powder A is sprayed onto the nonwoven fabric A (4) from the spraying device (20) in an amount of 50. g / m ² , and the powder A is heated and melted by a heating device (21). Then, the polymer film A (2) is overlaid and pressed with a heating roll (22) (22). A semi-finished product sheet (30) was obtained (first step).

Next, as shown in Fig. 3B, while the above-mentioned skin material A (3) is transported at a constant speed with its joint surface facing upward, a sprinkling cloth (20) is placed on the skin material A (3). ) From thermoplastic The resin powder A was sprayed at a spraying rate of 200 g / m ² , the powder A was heated and melted by a heating device (2 1), and then the semi-finished product sheet (30) manufactured in the first step was placed thereon. The sound-absorbing and water-insulating mat (1) is overlapped by superposing the sound-insulating layer (2) made of a polymer film as an intermediate layer and pressing them with a heating roll (22) (22). Obtained.

Examples 2 to 13

The same procedure as in Example 1 was repeated except that the polymer film used had a thickness, hardness, and volume occupied by air bubbles set to the values shown in Table 1.

).

Example 14

The same polymer film as in Example 1 except that polypropylene was selected as the type of resin constituting the polymer film (the conditions are the same, such as thickness, hardness, occupied volume ratio of bubbles, and thermally expandable microphone mouth capsule) In the same manner as in Example 1, a sound-absorbing and water-insulating mat (1) was obtained.

Example 15

A polymer film similar to that of Example 1 was used except that polyester was selected as the type of resin constituting the polymer film (the conditions for thickness, hardness, volume occupied by air bubbles, and thermal expansion microcapsules were the same). In the same manner as in Example 1, a sound absorbing and water-insulating mat (1) was obtained.

Comparative Example 1

A sound-absorbing and water-insulating mat (1) was obtained in the same manner as in Example 1 except that a low-density polyethylene (LLDPE) film containing no air bubbles (containing no heat-expandable microcapsules) was used as the polymer film. Was.

Comparative Example 2

The nonwoven fabric A and the skin material A are laminated and integrated via a breathable adhesive layer (400 g / m ² ) formed by heating and melting the thermoplastic resin powder A, and the sound absorbing and water-insulating mat is formed. Got (1)

Polymer film (water barrier layer)

'The sound-transmitting characteristics and film strength of the polymer films used in Examples 1 to 15 and Comparative Example 1 were examined based on the following evaluation methods. The results are shown in Table 2.

Sound passing characteristics evaluation method

A polymer film is attached to the opening (window) provided in the center of the soundproof partition wall, which completely divides the indoor space into two parts, so that it is completely closed without any gaps, and the sound is continuously output in one room. When this sound was generated and heard in the other room, the extent to which the sound was heard (sound permeability) was examined. The sound heard through the polymer film is actually heard by the ear, Evaluations were made on a five-point scale of “5”, “4”, “3”, “2”, and “1” in order of sound permeability. In other words, those with particularly good sound permeability are "5" and those with very good sound permeability.

"4", "3" indicates good sound permeability, "2" indicates poor sound permeability, and "1" indicates poor sound permeability.

Film strength evaluation method

Both ends of the polymer film cut into 2 cm × 10 cm were pulled by hand, and the evaluation was made on a five-point scale of “5”, “4”, “3”, “2”, and “1” in order of the film strength at that time. That is, "5" for particularly strong strength, "4" for very strong strength, "3" for strong strength, "2" for slightly weak strength, and "2" for weak strength. Was set to “1”.

The performance of each of the mats obtained as described above was evaluated based on the following evaluation method. The results are shown in Table 2. .

Sound absorption characteristics evaluation method

The sound absorption rate was measured in accordance with JIS A145 (normal incidence sound absorption rate).

Water barrier evaluation method

After the mat is laid on the floor, 5 OmL of water is dripped on the skin layer of the mat, and after 30 minutes, the mat is removed and the floor is observed. Those that were wet with water were marked "X", and those where the floor surface was not wet at all and the nonwoven sound absorbing layer of the mat was not wet at all were marked "〇".

[Table 2]

As is evident from the table, the mat of Example 1 15 of the present invention has excellent sound absorption and sufficient silence, and the strength of the water-blocking layer is obtained at + minutes to ensure water-blocking. I was able to.

On the other hand, in Comparative Example 1, although excellent in water shielding, it was inferior in sound absorption and could not ensure quietness. Further, in Comparative Example 2, although the sound absorbing property was excellent, water could not be blocked.

As described above, the sound-absorbing and water-insulating mat of the present invention is provided with the water-insulating layer made of a polymer film, so that water does not reach from the mat surface to the back surface thereof, and thus water is impermeable. Excellent in nature. In addition, noise from the lower side of the mat is absorbed by the lower sound absorbing layer, while noise on the upper side of the mat is passed through the polymer film (water-blocking layer) in which many bubbles are formed. The sound is sufficiently propagated to the sound absorbing layer, and the sound is absorbed by the sound absorbing layer, so that sufficient silence can be ensured in the space where the mat is laid. Further, since the polymer film layer in which a number of bubbles are formed is used for the intermediate layer, sound can be sufficiently absorbed even in a region of 250 to 200 Hz or a higher frequency region. Therefore, there is an advantage that excellent sound absorbing properties can be exhibited in such a wide frequency range.

In addition, when the skin material layer and the water-shielding layer, and the water-shielding layer and the sound-absorbing layer are respectively connected via a gas-permeable adhesive layer formed by heating and melting a thermoplastic resin powder,

However, it is possible to provide a sound-absorbing and water-insulating mat having more excellent durability while providing good air permeability as the air-permeable adhesive layer. In addition, since the sound absorbing effect is exhibited by the air layer portion of the adhesive layer, the sound absorbing performance as mat can be further improved.

When the thickness of the polymer film is 30 to 120 μιη, it is possible to further improve sound absorption while ensuring water-blocking.

When the hardness of the polymer film is 75 to 100, the sound permeability of the polymer film is further improved, so that the sound absorption performance as mat can be further improved.

When the ratio of the volume occupied by the bubbles to the apparent volume of the polymer film is 50 to 90%, it is possible to further improve the sound absorption while ensuring the water shielding.

When the bubbles are formed by the thermal expansion of the heat-expandable micro force cell, a large number of the bubbles in the polymer film become independent of each other, so that the polymer constituting the water-blocking layer is formed. It is possible to provide a film having sufficient strength as a film, thereby providing a sound-absorbing and water-insulating mat with excellent water-proof durability. In addition, since the size of the formed bubbles can be controlled uniformly, a desired sound permeability as a polymer film can be obtained, and a high-quality sound absorbing and water-insulating mat can be provided. When the polymer film is a polyolefin film, the cost can be reduced and the film can be easily recycled.

When the sound absorbing layer is made of a non-woven fabric, the weight of the mat can be reduced, and the cushioning properties of the mat can be improved, so that a good feeling of stepping can be obtained. The terms and descriptions used herein are used to describe the embodiments according to the present invention, and the present invention is not limited to these. The present invention allows for any design changes within the scope of the claims without departing from the spirit thereof. Industrial applicability

As described above, the sound-absorbing and water-insulating mat according to the present invention has both excellent sound-absorbing performance and sufficient water-insulating performance, and is therefore suitably used as a floor mat for automobiles.

Claims

The scope of the claims

1. A skin material layer (3) is joined to an upper surface of a water-insulating layer (2) made of a polymer film, and a sound-absorbing layer (4) is joined to a lower surface of the water-insulating layer (2). A sound-absorbing and water-insulating mat characterized by a number of bubbles formed in a film.

2. The sound-absorbing and water-insulating mat according to claim 1, wherein the thickness of the polymer film constituting the water-proof layer is 30 to 120 / m.

3. The sound-absorbing and water-insulating mat according to claim 1, wherein the hardness of the polymer film constituting the water-proof layer is 75 to 100.

4. The sound absorbing and water-insulating mat according to claim 1, wherein a ratio of an occupied volume of the bubble to an apparent volume of the polymer film is 50 to 90%.

5. The sound absorbing and water-insulating mat according to claim 1, wherein the air bubbles are formed by thermal expansion of the thermally expandable microcapsules.

6. The thickness of the polymer film constituting the water barrier layer is 30 to 120 ^ um, the hardness of the polymer film is 75 to 100, and the air bubbles of the polymer film with respect to the apparent volume of the polymer film. The sound-absorbing and water-insulating mat according to claim 4, wherein the proportion of the occupied volume is 50 to 90%, and the bubbles are formed by thermal expansion of the thermally expandable microcapsules.

7. The skin material layer (3) is bonded to the upper surface of the water-blocking layer (2) made of a polymer film via the air-permeable adhesive layer (5) formed by heating and melting thermoplastic resin powder. On the other hand, a sound-absorbing layer (4) is joined to the lower surface of the water-shielding layer (2) via a gas-permeable adhesive layer (6) formed by heating and melting a thermoplastic resin powder. A sound-absorbing and water-insulating mat, wherein a number of air bubbles (10) are formed in a child film.

8. The sound absorbing and water-insulating mat according to claim 4, wherein the thickness of the polymer film constituting the water-proof layer is 30 to 120 im.

9. The sound absorbing and water insulating mat according to claim 7, wherein the hardness of the polymer film constituting the water shielding layer is 75 to 100.

10. The sound-absorbing and water-insulating mat according to claim 7, wherein the hardness of the polymer film constituting the water-proof layer is 80 to 95.

1 1. The sound-absorbing and water-insulating mat according to claim 7, wherein a ratio of an occupied volume of the bubble to an apparent volume of the polymer film is 50 to 90%.

12. The sound absorbing and insulating mat according to claim 7, wherein a ratio of an occupied volume of the bubbles to an apparent volume of the polymer film is 65 to 80%.

13. The sound absorbing and insulating mat according to claim 7, wherein the bubbles are formed by thermal expansion of thermally expandable microcapsules. .

14. The thickness of the polymer film constituting the water barrier layer is 30 to 120 / zm, the hardness of the polymer film is 75 to 100, and the occupancy of the bubbles with respect to the apparent volume of the polymer film. The volume ratio is 50 to 90%, and the bubbles are thermally expanded. 8. The sound-absorbing and water-insulating mat according to claim 7, wherein the mat is formed by thermal expansion of a tonic micro force cell.

1 5. The sound absorbing and water insulating mat according to claim 7, wherein the polymer film constituting the water shielding layer is a polyolefin-based film.

1 6. The sound absorbing and water insulating mat according to claim 7, wherein the sound absorbing layer is made of a nonwoven fabric.

1 7. The a is. 3 to 3 Omm thickness of the nonwoven fabric, sound absorption seepage control mat ranges paragraph 16, wherein claims basis weight of the nonwoven fabric is 200~ 10 00 g / m ^2.

18. The sound absorbing and insulating mat according to claim 7, wherein the particle diameter of the thermoplastic resin powder is 20 to 500 μm.

1 9. The sound absorbing and insulating mat according to claim 7, wherein the thermoplastic resin powder is a polyolefin resin powder.

20. The sound absorbing and water insulating mat according to claim 7, wherein the thermoplastic resin powder is ethylene monoacetate butyl copolymer resin (EVA).