JP2017081103A - Air permeation adjustment adhesive sheet, manufacturing method thereof, and laminated sound absorption material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite sound absorption material and a sound-absorbing interior material, in which air permeability can be easily controlled and sound absorption performance can be improved by the control of air permeability.SOLUTION: Provided is a composite sound absorption material 1 formed by forming a synthetic resin foam layer 3 on a surface of a fiber substrate 2. In the synthetic resin foam layer 3 is used a synthetic resin emulsion in which thermally expandable microcapsules are mixed. The air permeability is adjusted to obtain a desired value by expanding the thermally expandable microcapsules by heating the synthetic resin emulsion and by changing the size of a space formed between the thermally expandable microcapsules depending on the degree of expansion of the thermally expandable microcapsules.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sound-absorbing adhesive sheet and a laminated sound-absorbing material used as a sound-absorbing material or a sound-absorbing interior material mainly used for engine hoods, engine undercovers, dash insulators and the like of automobiles.

Usually, sound absorbing materials and sound insulating materials are used in various sites to suppress noise. For example, for vehicles such as automobiles, it is adjusted so as to obtain the necessary sound absorption performance that exhibits a performance suitable for a target sound, rather than a sound insulating material having a large specific gravity and a high weight. Sound absorbing material is generally used. Examples of such a sound absorbing material for a vehicle include a dash insulator that suppresses noise from an engine room and a floor insulator that suppresses noise entering from outside the vehicle. For the material of the sound absorbing material, a porous material such as a fiber material such as felt or glass wool or a synthetic resin foam that can be molded into a predetermined shape such as urethane foam is adopted because of its low cost. Has been. For ordinary sound-absorbing materials, for the purpose of protecting the surface of the porous material, improving the appearance quality, etc., the surface of the porous material is made of a non-woven sheet lined with a synthetic resin foam. It is affixed to.
By the way, in the conventional sound-absorbing material for vehicles, with respect to the request | requirement of noise suppression performance and an improvement in sound-absorbing property, the thickness of this sound-absorbing material was thickened and the required sound-absorbing performance was obtained, and this request | requirement was responded.
However, in a vehicle, the shape and size of the sound absorbing material tend to be limited because the shape of the portion to which the sound absorbing material is attached and the size of the space are limited. Furthermore, recent vehicles tend to be strongly demanded to be lighter, and sound absorbing materials are also required to be lighter while maintaining or improving noise suppression performance and sound absorbing properties.
In order to meet the above requirements, the conventional method of easily increasing the thickness of the sound absorbing material to obtain the necessary sound absorbing performance may increase the size of the sound absorbing material and increase the weight. Can not. Therefore, recently, a method has been proposed for obtaining the necessary sound absorbing performance by setting the air permeability of the sound absorbing material within a predetermined range.
For example, in the sound absorbing type soundproof material for automobiles described in Patent Document 1, the basis weight is 10 to 200 g / m between the first sound absorbing layer and the second sound absorbing layer made of a fiber material or a foamable synthetic resin material. ² and a three-layer structure provided with an intermediate layer made of a nonwoven fabric having an air permeability of 3 to 35 cc / cm ² / sec.
In the vehicle sound absorbing material described in Patent Document 2, a fibrous nonwoven fabric or resin film having a basis weight of 15 to 200 g / m ² made of a thermoplastic synthetic resin is heat-sealed to a sound absorbing layer made of a porous material. Thus, a laminate having an air permeability of 1 to 25 cc / cm ² / sec is used.

Japanese Patent Laid-Open No. 2003-19930 JP 2005-263118 A

However, in order to keep the air permeability within a predetermined range as described above, for example, if it is a nonwoven fabric, it is difficult to maintain a stable air permeability due to unevenness in fabric weight, etc., and when a fibrous nonwoven fabric or a resin film is heat-sealed. However, it is difficult to maintain a stable air permeability because the melted resin plugs the holes for ventilation, and thus there is a problem that it is difficult to control the ventilation.
The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a ventilation adjusting adhesive sheet, a manufacturing method thereof, and a laminated sound absorbing material that can stably maintain an optimum air permeability for a desired sound absorbing performance and can easily control the ventilation adjustment.

In order to achieve the above object, the invention of the air conditioning adhesive sheet according to claim 1 comprises a surface layer made of a spunbond nonwoven fabric made of thermoplastic resin fibers having a first melting point, and laminated on one surface of the surface layer. A ventilation adjustment adhesive sheet comprising a synthetic resin foam, wherein the surface on the surface layer side is the front surface, the surface on the air conditioning layer side is the back surface, and the back surface is the synthetic resin foam. One surface of the surface layer on which the air-adjusting layer is laminated is made an adhesive surface by a powder made of a low-melting-point thermoplastic resin having a second melting point lower than the first melting point blended therein. The gist is that the water-repellent surface is formed by the water-repellent agent impregnated in the surface layer.
According to a second aspect of the present invention, there is provided an airflow adjustment adhesive sheet comprising a surface layer comprising a spunbond nonwoven fabric made of thermoplastic resin fibers having a first melting point, and a synthetic resin foam laminated on one surface of the surface layer. A first surface layered on one surface of the air flow adjusting layer, the surface of the air flow adjusting layer side as a back surface, and the back surface is laminated on one surface of the air flow adjusting layer. One surface of the surface layer on which the air flow adjusting layer is laminated is impregnated in the surface layer, and the surface is bonded with a spunbond nonwoven fabric made of a low melting point thermoplastic resin fiber having a second melting point lower than the melting point. The main point is that the surface is made water-repellent by a water-repellent agent.
The invention according to claim 3 is the invention of the air flow adjusting adhesive sheet according to claim 1 or 2, wherein the mass per unit area of the synthetic resin foam in the air flow adjusting layer is 20 to 100 g / m. ² ] and the gist is that the air permeability specified in JIS L 1096 is 0.5 to 50 [cc / (cm ² · sec)].
Invention of the ventilation adjustment adhesive sheet of Claim 4 is a manufacturing method of the ventilation adjustment adhesive sheet of Claim 1 or Claim 3, Comprising: It is a product made from the thermoplastic resin fiber which has 1st melting | fusing point. A step of obtaining a surface layer having a water repellent surface by impregnating a spunbond nonwoven fabric with a water repellent and a powder composed of a low melting thermoplastic resin having a second melting point lower than the first melting point Applying the liquid synthetic resin on the water-repellent surface of the surface layer to form an undried foam-like precursor layer, followed by drying by heating to obtain a ventilation adjusting layer from the foam-like precursor layer and providing an adhesive surface The gist is to have.
The invention of the method for producing a ventilation adjusting adhesive sheet according to claim 5 is the method for producing the ventilation adjusting adhesive sheet according to claim 2 or 3, wherein the ventilation adjusting adhesive sheet is made of a thermoplastic resin fiber having a first melting point. A process of obtaining a surface layer having a water repellent surface by impregnating a spunbond nonwoven fabric with a water repellent agent, and applying a liquid synthetic resin on the water repellent surface of the surface layer to obtain an undried foam-like precursor layer And a step of polymerizing a spunbond nonwoven fabric made of a low melting point thermoplastic resin fiber having a second melting point lower than the first melting point on the surface of the undried foam-like precursor layer, drying by heating, And a step of obtaining an air flow adjusting layer from the foam-like precursor layer and providing an adhesive surface.
According to a sixth aspect of the present invention, the air-adjusting adhesive sheet according to any one of the first to third aspects is adhered to the surface of the sound absorbing material via the adhesive surface. Is the gist.

[Action]
The airflow adjusting adhesive sheet of the present invention has a two-layer structure comprising a surface layer made of a spunbond nonwoven fabric made of thermoplastic resin fibers and an airflow adjusting layer made of a synthetic resin foam, and the surface on the surface layer side is the surface. And the surface on the air flow adjusting layer side is used as the back surface, and the surface is used facing a noise source or the like. Since the back surface of the ventilation adjusting adhesive sheet is an adhesive surface, it can be used as a laminated sound absorbing material together with the sound absorbing material by being adhered to the surface of the sound absorbing material via the adhesive surface.
The ventilation adjustment adhesive sheet of the present invention makes it easy to control the ventilation adjustment by controlling the ventilation adjustment with the ventilation adjustment layer made of a synthetic resin foam. That is, the air flow control in the air flow adjusting adhesive sheet of the present invention is mainly performed by adjusting the mass per unit area of the synthetic resin foam since the air adjustment layer is composed of the synthetic resin foam. , By appropriately adjusting the air permeability of the air flow adjusting layer.
Furthermore, the air-conditioning adhesive sheet of the present invention is stabilized by impregnating a spunbonded nonwoven fabric constituting the surface layer with a water repellent and making one surface of the surface layer on which the air-conditioning layer is laminated a water-repellent surface. The air permeability can be maintained. That is, in the air flow adjusting adhesive sheet of the present invention, the water-repellent surface prevents the liquid synthetic resin from being impregnated into the spunbond nonwoven fabric. For this reason, the impregnation of the synthetic resin can suppress a change in the air permeability of the nonwoven fabric constituting the surface layer, and the air permeability of the surface layer affects the control of air flow adjustment by the air flow adjusting layer. Can be suppressed.
Therefore, the air-conditioning adhesive sheet of the present invention, which suppresses impregnation of the synthetic resin into the nonwoven fabric by the water-repellent surface provided on the surface layer and controls the air-conditioning by the air-adjustment layer, has the optimum air permeability for the desired sound absorption performance. While being able to maintain stably, control of ventilation adjustment can be performed easily (Claim 1 or Claim 2).
Further, by setting the mass per unit area of the synthetic resin foam in the air flow adjusting layer to 20 to 100 [g / m ² ], the air flow adjusting adhesive sheet of the present invention has the air permeability specified in JIS L 1096. Can be stably maintained in the range of 0.5 to 50 [cc / (cm ² · sec)] (Claim 3).
The air flow adjusting adhesive sheet of the present invention comprises a spunbond nonwoven fabric impregnated with a water repellent, and a liquid synthetic resin in which a powder made of a low-melting thermoplastic resin and a foaming agent are blended on one surface of the spunbond nonwoven fabric. Apply or apply a liquid synthetic resin blended with a foaming agent to obtain an undried foam-like precursor layer, then polymerize a spunbond nonwoven fabric made of low-melting-point thermoplastic resin fibers on the surface and heat dry It is manufactured by doing. Therefore, according to the method for producing a ventilation adjustment adhesive sheet of the present invention, the ventilation adjustment adhesive capable of stably maintaining the optimum air permeability for the desired sound absorption performance and easily controlling the ventilation adjustment. The sheet can be easily manufactured (claim 4 or claim 5).
The laminated sound-absorbing material of the present invention is obtained by adhering the above-mentioned air-adjusting adhesive sheet to the surface of the sound-absorbing material via the adhesive surface on the back surface, and has an optimum air permeability for desired sound-absorbing performance. The sound absorption performance of the ventilation adjustment adhesive sheet that can be maintained stably and the ventilation adjustment can be easily performed, and the sound absorption performance of the sound absorption material, can exhibit excellent sound absorption performance it can.

〔effect〕
According to the ventilation adjustment adhesive sheet of the present invention, it is possible to stably maintain the optimum air permeability for a desired sound absorption performance, and it is possible to easily control the ventilation adjustment.
According to the method for producing a ventilation adjusting adhesive sheet of the present invention, there is provided a ventilation adjusting adhesive sheet capable of stably maintaining the optimum air permeability for a desired sound absorbing performance and easily controlling the ventilation adjustment. It can be manufactured easily.
According to the laminated sound-absorbing material of the present invention, the air-adjusting adhesive sheet that can stably maintain the optimum air permeability for the desired sound-absorbing performance and can easily control the air-adjusting is provided on the surface of the sound-absorbing material. Excellent sound absorption performance can be achieved simply by bonding to the surface.

Sectional drawing which shows the ventilation adjustment adhesive sheet of embodiment. Sectional drawing which shows the laminated sound-absorbing material of embodiment. Explanatory drawing which shows the manufacturing process of the ventilation adjustment adhesive sheet of a 1st form. Explanatory drawing which shows the manufacturing process of the ventilation adjustment adhesive sheet of a 2nd form. The graph which shows the measurement result of the reverberation room method sound absorption coefficient. The graph which shows the measurement result of the reverberation room method sound absorption coefficient.

An embodiment embodying the present invention will be described in detail below.
[Ventilation adjustment adhesive sheet]
[Schematic configuration]
As shown in FIG. 1, the air flow adjusting adhesive sheet 1 has a two-layer structure of a surface layer 2 and a gas flow adjusting layer 3 laminated on the back surface which is one surface of the surface layer 2.
The back surface which is one surface of the surface layer 2 is a water repellent surface 4. Therefore, in the air flow adjusting adhesive sheet 1, the surface layer 2 and the air flow adjusting layer 3 can be substantially clearly separated with the water repellent surface 4 as a boundary.
One surface (back surface) of the air flow adjusting layer 3 is an adhesive surface 5.
The air flow adjusting adhesive sheet 1 has the surface on the surface layer 2 side as the front surface, the surface on the air flow adjusting layer 3 side as the back surface, and the surface faces the noise source. Used. When the noise passes through the surface layer 2 and the air flow adjusting layer 3, the air flow adjusting adhesive sheet 1 causes the surface layer 2 and the air flow adjusting layer 3 to exert a buffer sound absorbing action on the noise. The sound absorbing effect is exhibited.

[Surface]
In the airflow adjusting adhesive sheet 1, the surface layer 2 is provided in order to maintain the overall air permeability of the airflow adjusting adhesive sheet 1 together with the airflow adjusting layer 3 within an optimum range for a desired sound absorbing performance. It is. In addition, the surface layer 2 has a function of protecting the ventilation adjustment layer 3.
The surface layer 2 is composed of a spunbonded nonwoven fabric made of thermoplastic resin fibers having a first melting point. The first melting point of the spunbonded nonwoven fabric is 180 to 260 ° C. from the viewpoint of preventing deformation and melting of the spunbonded nonwoven fabric when the air-adjusting adhesive sheet 1 is used by bonding with the adhesive surface 5. A range is preferred. The thermoplastic resin fiber having such a melting point has a melting point such as a polyester such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) or a polyamide resin such as nylon 6, nylon 11 or nylon 66. Examples thereof include fibers made of a high melting point thermoplastic resin having a temperature of 180 ° C. or higher.
From the viewpoint of imparting predetermined air permeability to the surface layer 2 so as to make the entire air conditioning adhesive sheet 1 have a desired air permeability, the fiber diameter of the thermoplastic resin fibers used in the spunbonded nonwoven fabric is 10 to 10. It is preferable to set in the range of 30 μm. From the same viewpoint, the mass per unit area of the spunbonded nonwoven fabric (hereinafter also referred to as “unit mass” for short) is preferably set to 10 to 50 g / m ² .

[Water repellent surface]
In the air flow adjusting adhesive sheet 1, the water repellent surface 4 prevents the synthetic resin constituting the air flow adjusting layer 3 from being impregnated into the spunbond nonwoven fabric constituting the surface layer 2 to prevent the air flow of the surface layer 2 from being hindered. It is provided for this purpose. In addition, the water-repellent surface 4 has a function of stably maintaining the ventilation performance of each layer by clearly dividing the surface layer 2 and the ventilation adjustment layer 3 at the boundary between the layers.
The water repellent surface 4 is provided by impregnating a spunbonded nonwoven fabric constituting the surface layer 2 with a water repellent. The water repellent is not particularly limited as long as it can be impregnated into the spunbond nonwoven fabric constituting the surface layer 2. Examples of the water repellent include fluororesin, wax, zirconium salt, Werner type Cr, Al complex salt compound having a fatty alkyl group, methylolated fatty acid amide, polyorganosiloxane and the like.
The water repellent agent is used by impregnating the spunbonded nonwoven fabric constituting the surface layer 2 after preparing a solution or dispersion. For example, when a fluororesin is used as the water repellent, the spunbond nonwoven fabric constituting the surface layer 2 is immersed in an aqueous dispersion in which the fluororesin is dispersed in an amount of 0.5 to 2% by mass. It is desirable to set the adhesion amount of the fluororesin in the range of 0.1 to 1 g / m ² .

(Ventilation adjustment layer)
In the airflow adjustment adhesive sheet 1, the airflow adjustment layer 3 is provided to control the airflow adjustment by adjusting the air permeability of the entire airflow adjustment adhesive sheet 1. That is, the air permeability of the entire air flow adjusting adhesive sheet 1 is determined by the air permeability of the air flow adjusting layer 3.
The ventilation adjustment layer 3 is made of a synthetic resin foam. Examples of the synthetic resin in the synthetic resin foam include acrylic resin, ethylene-vinyl acetate resin, styrene-butadiene resin, acrylonitrile-butadiene resin, acrylonitrile-butadiene-styrene resin, and acrylic-vinyl acetate resin. The synthetic resin has a glass transition point (Tg) of −40 ° C. to + 30 ° C. from the viewpoint of preventing deformation and melting when the air-adjusting adhesive sheet 1 is adhered and used by the adhesive surface 5. It is desirable to use the thing of the range.
The synthetic resin is used in the form of a hydroxide emulsion or an aqueous dispersion, that is, a liquid synthetic resin in order to form a foam. Specifically, the formation of the air flow adjusting layer 3 with a synthetic resin foam is performed by using an aqueous emulsion or aqueous dispersion of the synthetic resin as follows: (1) CMC, acid-containing cross-linked acrylic resin emulsion (for example, ASE-60: trade name) (Rohm and Haas, Inc.) and other thickeners to increase the viscosity and stir while blowing air to mix the air, or (2) after adding the foaming agent without thickening or thickening Then, using a knife coater, a roll coater or the like, the coating is performed on one surface (back surface) of the spunbond nonwoven fabric constituting the surface layer 2.
The mass per unit area of the synthetic resin foam in the ventilation adjustment layer 3 can maintain the air permeability stably, and can suitably control the ventilation adjustment by the ventilation adjustment layer 3. From the viewpoint of being, it is preferable that the range is ²⁰ to 100 g / m ² . That is, the above-mentioned adjustment of the ventilation is performed by changing the expansion ratio of the synthetic resin foam. When the mass per unit area of the synthetic resin foam is less than 20 g / m ² , the air permeability by changing the expansion ratio. In the case where the change in the air flow rate is excessively large and the mass per unit area exceeds 100 g / m ² , the change in the air permeability due to the change in the foaming ratio becomes excessively small, so that it is difficult to control the air flow adjustment. In addition, the mass per unit area of the synthetic resin foam can be adjusted by the coating amount per unit area of the liquid synthetic resin on one surface (back surface) of the spunbonded nonwoven fabric.
Further, the air flow adjusting layer 3 may be subjected to a flame retardant treatment as desired. In the flame retardant treatment, for example, a flame retardant such as a metal hydrate such as aluminum hydroxide or magnesium hydroxide, or a phosphate compound such as ammonium phosphate or ammonium polyphosphate is added to the liquid synthetic resin. Is done by.

[Adhesive surface]
In the airflow adjusting adhesive sheet 1, the adhesive surface 5 is provided to adhere the airflow adjusting adhesive sheet 1 to the surface of a sound absorbing material such as glass wool or felt, or to adhere to the body of a vehicle. Is. The adhesive surface 5 is provided by imparting adhesiveness to the back surface, which is one surface of the air flow adjusting layer 3.
About the structure of the said adhesive surface, the following two forms are mentioned. That is, the adhesive surface 5 of the first form is made of a powder made of a low melting point thermoplastic resin having a second melting point lower than the first melting point in the synthetic resin foam constituting the air flow adjusting layer 3. It is comprised by mix | blending. The adhesive surface 5 of the second form is formed by laminating a spunbond nonwoven fabric made of a low-melting-point thermoplastic resin fiber having a second melting point lower than the first melting point on the back surface, which is one surface of the ventilation adjustment layer 3. It is configured by being. In the configuration of the bonding surface 5, either the first form or the second form may be used, and they are usually properly used as desired.
The second melting point on the bonding surface is lower than the first melting point, and the spunbond nonwoven fabric or the synthetic resin foam is used when the air flow adjusting adhesive sheet 1 is bonded and used by the bonding surface 5. From the viewpoint of preventing deformation and melting of the body, a range of 100 to 150 ° C. is preferable. Examples of the low melting point thermoplastic resin having the second melting point include low melting point polyethylene terephthalate (PET), polypropylene (PP), and polyethylene (PE).
Moreover, it is preferable that the unit mass is set to 15-50 g / m < ² > from the viewpoint that the said adhesive surface 5 does not prevent the ventilation | gas_flowing of the said ventilation adjustment adhesive sheet 1 whole. Adjustment of the unit mass in the adhesive surface 5 of a 1st form is performed by adjusting the compounding quantity of the powder with respect to the said synthetic resin foam (liquid synthetic resin). Adjustment of the unit mass in the adhesive surface 5 of a 1st form is performed by adjusting the fabric weight (mass per unit area) of the spun bond nonwoven fabric to be used.

[Air permeability]
The air permeability is an important factor for the sound absorption performance of the air flow adjusting adhesive sheet 1. Among the constituent elements of the airflow adjusting adhesive sheet 1, the airflow adjusting layer 3 affects the air permeability.
The air permeability of the air flow adjusting adhesive sheet 1 is adjusted mainly by the mass per unit area of the synthetic resin foam in the air flow adjusting layer 3 described above, and further, foaming of the synthetic resin foam constituting the air flow adjusting layer 3 is performed. Fine adjustment is possible depending on the magnification. The expansion ratio of the synthetic resin foam can be adjusted, for example, by adjusting the addition amount of the foaming agent, adjusting the air mixing amount, adjusting the heating temperature or drying time in heat drying.
The air permeability is specified in JIS L 1096, and the air permeability of the air conditioning adhesive sheet 1 is 0.5 [cc / (cm ² · sec)] or more and 50 [cc / (cm ² · sec)]. It is preferable to set the following range. When the air permeability exceeds 50 [cc / (cm ² · sec)], the sound is allowed to pass through without exerting a buffer sound absorbing action, so that there is a possibility that a suitable sound absorbing performance cannot be exhibited. In addition, when the air permeability is less than 0.5 [cc / (cm ² · sec)], a phenomenon occurs in which the sound is reflected without passing through in a high frequency sound range (about 3000 Hz or more), and the sound absorbing performance is deteriorated. There is a fear.
The upper limit value of the air permeability of the air flow adjusting adhesive sheet 1 is more preferably 21 [cc / (cm ² · sec)] or less, still more preferably 18 [cc / (cm ² · sec)] or less, and still more. It is preferably 12.5 [cc / (cm ² · sec)] or less.

[Manufacturing method of ventilation adjustment adhesive sheet]
[First form]
In FIG. 3, the manufacturing process in case the said adhesive surface 5 is a 1st form is shown.
(Process A)
A spunbond nonwoven fabric 21 made of thermoplastic resin fibers having a first melting point is drawn out from the roll 2A. The spunbond nonwoven fabric 21 is filled with a water repellent that is, for example, a 20% by mass aqueous dispersion of a fluororesin. The spunbonded nonwoven fabric 21 is impregnated with a water repellent by being guided to the water treatment tank 11 through the immersion roll 11A.
The spunbond nonwoven fabric 21 is pulled out from the water repellent treatment tank 11 and pressed by a press roll 12 to adjust the amount of impregnation of the water repellent agent, and is then sent to a plurality of stages of steam drums 13 for heating and drying. Is done.
By the step A, the surface layer 2 made of the spunbond nonwoven fabric 21 in the air flow adjusting adhesive sheet 1 and the water repellent surface 4 provided on one surface of the surface layer 2 are obtained.
(Process B)
After the step A, a liquid synthetic resin in which a powder made of a low melting point thermoplastic resin is blended on one surface (the surface in FIG. 3) of the spunbond nonwoven fabric 21 impregnated with a water repellent by the knife coater 14. (A foamed synthetic resin emulsion or dispersion, or a synthetic resin emulsion or dispersion to which a foaming agent is added) is applied to form an undried foam-like precursor layer 31.
The undried foam-like precursor layer 31 is formed on one surface of the spunbond nonwoven fabric 21 and then introduced into the dryer 16. In the dryer 16, the foam-like precursor layer 31 is usually dried at 140 ° C. to 200 ° C., preferably 150 ° C. to 170 ° C., to dry solidify or foam (expand) the foaming agent. Solidified.
In the step B, the foam-like precursor layer 31 is heat-dried, whereby the ventilation adjustment layer 3 in the ventilation adjustment adhesive sheet 1 and the adhesive surface 5 provided on one surface of the ventilation adjustment layer 3 are obtained. .
(Final process)
The raw fabric sheet 1B manufactured in the above process is cut into a predetermined dimension by the cutter 17, and the ventilation adjusting adhesive sheet 1 is manufactured.

[Second form]
In FIG. 4, the manufacturing process in case the said adhesive surface 5 is a 2nd form is shown. In addition, in the said manufacturing process, since the process A and the last process are the same as the manufacturing process in case the said adhesive surface 5 is a 1st form, it abbreviate | omits.
(Process B)
After the step A, a liquid synthetic resin (a foamed synthetic resin emulsion or dispersion) or a surface of the spunbond nonwoven fabric 21 impregnated with a water repellent agent (surface in FIG. 3) is impregnated by the knife coater 14 or A synthetic resin emulsion or dispersion to which a foaming agent has been added is applied, and an undried foam-like precursor layer 31 is formed.
(Process C)
A spunbond nonwoven fabric 41 made of low-melting point thermoplastic resin fibers drawn out from the roll 4 A is pressure-bonded on one surface of the undried foam-like precursor layer 31 by a pressure-bonding roll 15. At this time, the undried foam-like precursor layer 31 is slightly permeated into the spunbond nonwoven fabric 41 so that the foam-like precursor layer 31 and the spunbond nonwoven fabric 41 are integrated.
Thereafter, the foamed precursor layer 31 is introduced into the dryer 16 and heated to 140 ° C. to 200 ° C., preferably 150 ° C. to 170 ° C. It is dried and solidified.
In the step C, the foam-like precursor layer 31 integrated with the spunbond nonwoven fabric 41 is heat-dried, so that the air-adjusting layer 3 in the air-adjusting adhesive sheet 1 and one surface of the air-adjusting layer 3 The provided adhesive surface 5 is obtained.

[Laminated sound absorbing material]
As shown in FIG. 2, the laminated sound absorbing material 1A is bonded to the surface of a sound absorbing material 6 conventionally used such as a fiber material such as felt and glass mat, a synthetic resin foam such as polyurethane foam and polystyrene foam. The ventilation adjusting adhesive sheet 1 is thermally bonded via the surface 5 to be configured.
The air-adjusting adhesive sheet 1 can be used as a single sound-absorbing material, but by combining with the sound-absorbing material 6 to form the laminated sound-absorbing material 1A, a sound-absorbing material that has been conventionally used. It can also be used to improve the sound absorption characteristics.
That is, by adhering the air flow adjusting adhesive sheet 1 to the sound source side surface (usually the surface) of the sound absorbing material 6, the air permeability on the sound source side surface of the laminated sound absorbing material 1A is substantially the same. The air permeability of the adhesive sheet 1 is approximately the same value. Therefore, the air permeability of the laminated sound absorbing material 1A obtained by bonding the air flow adjusting adhesive sheet 1 to the sound absorbing material 6 without being affected by the type of the sound absorbing material 6 and the air permeability inherent to the sound absorbing material 6. Is constant unless the air permeability of the air flow adjusting adhesive sheet 1 is changed. For this reason, by adjusting the air permeability of the air flow adjusting adhesive sheet 1 so as to obtain a desired sound absorbing characteristic, the air flow adjusting adhesive sheet 1 is bonded to the surface of the sound absorbing material 6 that has been conventionally used. Thus, the laminated sound-absorbing material 1A having a desired sound-absorbing characteristic can be easily obtained.
For bonding the air flow adjusting adhesive sheet 1 to the sound absorbing material 6, the adhesive surface 5 is heated to the second melting point or higher to soften the low melting point thermoplastic resin, and the adhesive surface 5 is It is performed simply by crimping to the material 6 and is very simple. Furthermore, the adhesive surface 5 made of the powder blended in the synthetic resin foam or the spunbonded nonwoven fabric laminated on the synthetic resin foam is bonded by expanding the adhesive portion in a planar shape like a normal adhesive. However, the air-adjusting adhesive sheet 1 and the sound-absorbing material 6 through the air-adjusting adhesive sheet 1 are not obstructed since the adhering portions are dispersed and adhered in the form of dots. .
If the laminated sound-absorbing material 1A is a vehicle, for example, a dash insulator, a floor insulator, a ceiling material, a door trim or the like is used as a normal sound-absorbing material, and the ventilation adjusting adhesive sheet 1 is adhered to the surface of the sound-absorbing material. It is possible. In addition, by adhering the ventilation adjustment adhesive sheet 1 to the surface of the engine hood, engine under cover, body panel, etc., the above-mentioned lamination is performed using the outside air of the engine hood, engine under cover, body panel, etc. as a sound absorbing material. It is also possible to constitute the sound absorbing material 1A. Furthermore, it may be used not only for vehicles but also for floors and walls of houses and buildings, or for pipes of clean water and sewage.

[Example 1]
(Ventilation adjustment adhesive sheet)
Surface layer: A PET spunbond nonwoven fabric having a unit mass of 20 g / m ² was used as a surface layer.
Water-repellent surface: A fluorine-based water repellent was impregnated and applied to the PET spunbonded nonwoven fabric with an adhesion amount of 0.5 g / m ² to make one surface of the surface layer a water-repellent surface.
Air flow adjusting layer: A liquid acrylic resin was foamed and applied on the water repellent surface at a unit mass of 40 g / m ² , dried and solidified to obtain a gas flow adjusting layer.
Adhesive surface: Polyester powder was blended with the liquid acrylic resin at a unit mass of 20 g / m ² , and one surface of the air flow adjusting layer was used as an adhesive surface.
[Laminated sound absorbing material]
The above air-adjusting adhesive sheet was bonded to the surface of a sound absorbing material (made of glass wool, unit mass 500 g / m ² , thickness 10 t (10 mm)) through the bonding surface to obtain a laminated sound absorbing material.

[Example 2]
(Ventilation adjustment adhesive sheet)
Surface layer: A PET spunbond nonwoven fabric having a unit mass of 20 g / m ² was used as a surface layer.
Water-repellent surface: A fluorine-based water repellent was impregnated and applied to the PET spunbonded nonwoven fabric with an adhesion amount of 0.5 g / m ² to make one surface of the surface layer a water-repellent surface.
Air flow adjusting layer: A liquid acrylic resin was foamed and applied on the water repellent surface at a unit mass of 40 g / m ² , dried and solidified to obtain a gas flow adjusting layer.
Adhesive surface: After applying the above-mentioned liquid acrylic resin by foaming, a spunbond nonwoven fabric made of polypropylene having a unit mass of 20 g / m ² is laminated on the surface, and the acrylic resin is dried and solidified. did.
[Laminated sound absorbing material]
The above air-adjusting adhesive sheet was bonded to the surface of a sound absorbing material (made of glass wool, unit mass 500 g / m ² , thickness 10 t (10 mm)) through the bonding surface to obtain a laminated sound absorbing material.

[Example 3]
(Ventilation adjustment adhesive sheet)
The same thing as the ventilation adjustment adhesive sheet of the said Example 1 was used.
[Laminated sound absorbing material]
The above air-adjusting adhesive sheet was bonded to the surface of a sound absorbing material (made of glass wool, unit mass 1000 g / m ² , thickness 20 t (20 mm)) through the bonding surface to obtain a laminated sound absorbing material.

[Comparative Example 1]
About each comparative example after this comparative example 1, it replaced with the ventilation adjustment adhesive sheet of said each Example, and the thing of the structure shown to each comparative example was used as a normal skin material.
[Skin material]
Surface layer: A PET needle punched nonwoven fabric having a unit mass of 82 g / m ² was used as the surface layer.
Foamed resin layer: A liquid acrylic resin was foamed and applied to the PET needle punched nonwoven fabric at a unit mass of 23 g / m ² and dried and solidified to obtain a foamed resin layer.
Adhesive surface: After applying the above-mentioned liquid acrylic resin by foaming, a spunbond nonwoven fabric made of polypropylene having a unit mass of 20 g / m ² is laminated on the surface, and the acrylic resin is dried and solidified. did.
[Laminated sound absorbing material]
The skin material was bonded to the surface of a sound absorbing material (made of glass wool, unit mass 500 g / m ² , thickness 10 t (10 mm)) through the bonding surface to obtain a laminated sound absorbing material.

[Comparative Example 2]
[Skin material]
Surface layer: A PET needle punched nonwoven fabric having a unit mass of 82 g / m ² was used as the surface layer.
Foamed resin layer: A liquid acrylic resin was foamed and applied to the PET needle punched nonwoven fabric at a unit mass of 23 g / m ² and dried and solidified to obtain a foamed resin layer.
Adhesive surface: After applying the above-mentioned liquid acrylic resin by foaming, a spunbond nonwoven fabric made of polypropylene having a unit mass of 20 g / m ² is laminated on the surface, and the acrylic resin is dried and solidified. did.
[Laminated sound absorbing material]
The above air-adjusting adhesive sheet was bonded to the surface of a sound absorbing material (made of glass wool, unit mass 1000 g / m ² , thickness 20 t (20 mm)) through the bonding surface to obtain a laminated sound absorbing material.

[Comparative Example 3]
[Skin material]
Surface layer: A PET needle punched nonwoven fabric having a unit mass of 82 g / m ² was used as the surface layer.
Foamed resin layer: A liquid acrylic resin was foamed and applied to the PET needle punched nonwoven fabric at a unit mass of 23 g / m ² and dried and solidified to obtain a foamed resin layer.
Adhesive surface: After applying the above-mentioned liquid acrylic resin by foaming, a spunbond nonwoven fabric made of polypropylene having a unit mass of 20 g / m ² is laminated on the surface, and the acrylic resin is dried and solidified. did.
[Laminated sound absorbing material]
The above air-adjusting adhesive sheet was bonded to the surface of a sound absorbing material (made of glass wool, unit mass 1500 g / m ² , thickness 20 t (20 mm)) through the bonding surface to obtain a laminated sound absorbing material.

[Performance evaluation 1]
[Measurement of sound absorption rate 1]
For Example 1 and Comparative Example 1, the sound absorption rate was measured according to the reverberation chamber method sound absorption rate measurement method defined in JIS A1409. The results are shown in the graph of FIG.
As shown in the graph of FIG. 5, Example 1 using the ventilation adjustment adhesive sheet has a higher sound absorption rate and excellent sound absorption performance than Comparative Example 1 using a normal skin material in the entire measured frequency range. It was shown that.
[Performance comparison]
About Example 1 and Example 2, the sound-absorbing performance and the durability performance were sensitively evaluated. As a result, Example 2 showed the same performance as Example 1.

[Performance evaluation 2]
For Example 3 and Comparative Examples 2 and 3, the sound absorption rate was measured according to the reverberation chamber method sound absorption rate measurement method defined in JIS A1409. The result is shown in the graph of FIG.
As shown in the graph of FIG. 6, Example 3 using the ventilation adjustment adhesive sheet has a higher sound absorption rate and excellent sound absorption performance than Comparative Example 2 using a normal skin material in the entire measured frequency range. It was shown that.
In Comparative Example 3, in which the unit mass of the sound absorbing material used is higher than that in Comparative Example 2, the sound absorption rate is lower than that in Example 2 in the low frequency range of the measured frequency, and higher than in Example 3 in the high frequency range of the measured frequency. Although the sound absorption coefficient was slightly higher, considering that the weight was higher than that of Example 3, Example 3 was shown to be lighter than Comparative Example 3 and superior in sound absorption performance.

  The present invention provides a ventilation adjustment adhesive sheet capable of stably maintaining the optimum air permeability for a desired sound absorption performance and easily controlling ventilation adjustment, a method for manufacturing the same, and the ventilation adjustment adhesion. Since the laminated sound-absorbing material whose sound-absorbing characteristics are improved by the sheet is provided, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Air flow adjustment adhesive sheet 1A Laminated sound absorbing material 2 Surface layer 3 Air flow adjusting layer 4 Water repellent surface 5 Adhesive surface 6 Sound absorbing material

Claims (6)

A ventilation adjustment adhesive sheet comprising a surface layer made of a spunbond nonwoven fabric made of thermoplastic resin fibers having a first melting point, and a ventilation adjustment layer made of a synthetic resin foam laminated on one surface of the surface layer,
The low-melting point having the second melting point lower than the first melting point blended in the synthetic resin foam, with the surface on the surface side as the front surface and the surface on the air-permeable adjustment layer side as the back surface. The adhesive surface is made of powder made of thermoplastic resin,
One surface of the said surface layer on which the said air flow adjustment layer is laminated | stacked is made into the water repellent surface with the water repellent impregnated to this surface layer, The air flow adjustment adhesive sheet characterized by the above-mentioned. A ventilation adjustment adhesive sheet comprising a surface layer made of a spunbond nonwoven fabric made of thermoplastic resin fibers having a first melting point, and a ventilation adjustment layer made of a synthetic resin foam laminated on one surface of the surface layer,
A low melting point having a surface on the surface layer side as a front surface and a surface on the air flow adjustment layer side as a back surface, the back surface having a second melting point lower than the first melting point laminated on one surface of the air flow adjustment layer. With the spunbond nonwoven fabric made of thermoplastic resin fibers as the adhesive surface,
One surface of the said surface layer on which the said air flow adjustment layer is laminated | stacked is made into the water repellent surface with the water repellent impregnated to this surface layer, The air flow adjustment adhesive sheet characterized by the above-mentioned. The mass per unit area of the synthetic resin foam in the ventilation adjustment layer is 20 to 100 [g / m ² ],
The ventilation adjusting adhesive sheet according to claim 1 or ² , wherein the air permeability specified in JIS L 1096 is 0.5 to 50 [cc / (cm ² · sec)]. It is a manufacturing method of the ventilation adjustment adhesive sheet according to claim 1 or 3,
A step of obtaining a surface layer having a water repellent surface by impregnating a spunbond nonwoven fabric made of a thermoplastic resin fiber having a first melting point with a water repellent;
An undried foam-like precursor layer is formed by applying a liquid synthetic resin containing a powder composed of a low-melting thermoplastic resin having a second melting point lower than the first melting point on the water-repellent surface of the surface layer. And heat drying to obtain an air flow adjusting layer from the foam-like precursor layer and providing an adhesive surface;
A method for producing a ventilation adjusting adhesive sheet, comprising: It is a manufacturing method of the ventilation adjustment adhesive sheet according to claim 2 or 3,
A step of obtaining a surface layer having a water repellent surface by impregnating a spunbond nonwoven fabric made of a thermoplastic resin fiber having a first melting point with a water repellent;
Applying a liquid synthetic resin on the water-repellent surface of the surface layer to obtain an undried foam-like precursor layer;
A spunbond nonwoven fabric made of a low-melting-point thermoplastic resin fiber having a second melting point lower than the first melting point is polymerized on the surface of the undried foam-like precursor layer, dried by heating, and the foam-like precursor Obtaining a ventilation control layer from the layer and providing an adhesive surface;
A method for producing a ventilation adjusting adhesive sheet, comprising: A laminated sound-absorbing material, wherein the ventilation adjusting adhesive sheet according to any one of claims 1 to 3 is adhered to the surface of the sound-absorbing material via the adhesive surface.

Images