JP2002079598A - Noise absorbing material and noise absorbing plate using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise absorbing material and a noise absorbing plate having an excellent water repellent property while keeping fire retardation essential for a noise absorbing material used for a construction such as a road and a railway. SOLUTION: A noise absorbing material comprises a skin material having a basis weight of not less than 30 g/m2 and composed of a fabric treated with a fluorine-containing compound having a urethane bond and a base material having a density of not less than 0.02 g/cm3 and composed of a fiber assembly, each fiber being partly bonded to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-absorbing material and a sound-absorbing plate for the purpose of reducing noise when constructing civil engineering facilities such as roads and railways, building facilities such as buildings, and the like. It is.

[0002]

2. Description of the Related Art Conventionally, as a sound absorbing material of a sound absorbing plate used for a construction such as a road or a railway, a glass fiber aggregate is used as a base material. Such a sound absorbing material has a fatal defect that the elongation of the glass fiber is extremely low. Due to deterioration, shape collapse is likely to occur, and scattering of glass fiber pieces and breakage during construction may be a concern. In order to compensate for the drawback, a glass fiber aggregate wrapped with a synthetic resin film or glass fiber fabric has been developed, but it is not enough to prevent it with a water-repellent glass fiber fabric. In addition, since the film wrapped with a synthetic resin film is vulnerable to tearing of the film itself, it is easily broken at the time of construction or the like, and it is difficult to sufficiently secure waterproofing even if repaired. You.

[0003] Recently, in order to remedy such a drawback, a device using a fiber aggregate using synthetic fibers has been proposed. However, when this is actually applied, problems such as intrusion of rainwater occur, and it is necessary to impart water repellency. However, application of a normal water repellent impairs flame retardancy, another required property. In addition, there has been a problem that it is necessary to apply various drugs in order to achieve both.

[0004]

SUMMARY OF THE INVENTION In view of the background of the prior art, the present invention has an excellent repellency while having a flame-retardant performance, which is essential as a sound-absorbing material used in roads and railways. A sound absorbing material and a sound absorbing plate having water performance are provided.

[0005]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the sound absorbing material of the present invention has a basis weight of 30 g / m ^2.
And a skin material made of a cloth treated with a fluorine-containing compound having a urethane bond, and a density of 0.02 g.
/ Cm ³ or more, and a substrate made of a fiber aggregate in which fibers are partially adhered to each other.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The object of the present invention is to provide a sound-absorbing material having excellent water-repellent performance while having an essential flame-retardant performance as a sound-absorbing material used for constructions such as roads and railways. As a skin material constituting the sound-absorbing material, we used a cloth with a specific basis weight, which was treated with a fluorine-containing compound having a specific urethane bond, to solve these problems all at once. Was determined.

For the sound absorbing material of the present invention, it is necessary to use a skin material made of a cloth having a basis weight of 30 g / m ² or more. If the basis weight is less than 30 g / m ² , a problem occurs that the weather resistance is reduced and the product cannot be used. The upper limit of the basis weight is not particularly limited, but if it is too thick, it may cause a decrease in sound absorption performance, and is preferably 100 g / m ² or more and 500 g / m ² or less. Thereby, both weather resistance performance and sound absorption performance can be balanced.

[0008] The fabric may be a nonwoven fabric, a woven fabric, or a knitted fabric, as long as it has air permeability and appropriate strength, or may be a composite body obtained by laminating them. The air permeability is a required characteristic that does not impair the sound absorbing performance, and is, for example, 10 cc / cm ² / sec.
What is necessary is just what has air permeability of c or more. It is preferably at least 20 cc / cm ² / sec. The fibers constituting such a fabric may be any of staples and filaments, and may be any of the above-mentioned nonwoven fabrics, woven fabrics and knitted fabrics. However, from the viewpoint of manufacturing cost and strength characteristics, long fibers in which fibers are partially bonded to each other Nonwoven fabric composed of is preferably used, especially by a spunbond manufacturing method, by a thermal bond manufacturing method in which fibers are partially bonded to each other,
This is preferable because "moking" on the fabric surface can be eliminated.

[0009] The fabric used for the sound absorbing material of the present invention must be treated with a fluorine-containing compound having a urethane bond. The main component usually used as a water repellent is a silicon-based or fluorine-based water repellent in many cases, and even a fluorine-based water repellent is usually a polymer-type acrylic copolymer containing a perfluoroalkyl group. Although coalesce or ester type fluorine compounds are widely used,
In the sound-absorbing material of the present invention, it is necessary to have a flame-retardant performance simultaneously with water-repellent performance, and such a performance can be obtained by using a fluorine-containing compound having a urethane bond without adding a flame-retardant. It has succeeded in achieving both performances. Of course, the fluorine-containing compound having a urethane bond may be a polymer or an oligomer, for example, a urethane compound containing a perfluoroalkyl group. However, the fluorine-containing compound must be a polymer from the viewpoint of water repellency. From the viewpoint of flame retardancy, a low polymer such as an oligomer is preferable. As specific examples of such compounds, for example, Asahigard AG-3001, Asahigard AG-320 and Asahigard LS-320A manufactured by Asahi Glass Co., Ltd. can be preferably used.

[0010] The amount of the compound attached is not particularly limited as long as it is an amount necessary for achieving both of these properties, but is preferably 0.1% by weight or more, more preferably 1% by weight or more. The content of 10% by weight or less is preferable from the viewpoint of durability.

The skin material of the sound absorbing material of the present invention may contain an acrylic fluorine compound or a silicone compound as long as the performance is not impaired. Also,
Other performances, such as antifouling performance, flexibility performance, and nitrogen oxide reduction performance by a photocatalyst, may be provided.

In order to further improve the flame retardancy, a so-called flame retardant may be added. Such flame retardants are not particularly limited, but include, for example, tricresiphosphate, tris-2-chloroethylphosphate,
Neighboring compounds such as tris 2,4,6 tribromophenyl phosphate, hexabromocyclododecane, halogenated phenylglycidyl ether derivatives, vinylphosphonic acid, trianyl phosphate, aliphatic cyclic phosphonates, halogen compounds and inorganic compounds A fuel or the like can be used.

When a water repellent or a flame retardant is attached to the skin material used for the sound absorbing material of the present invention to impart functionality, if necessary, a penetrant may be added to improve the permeability. Good.

The base material of the sound absorbing material of the present invention has a specific gravity of 0.02 g / cm ³ or more in order to maintain the form as a fibrous structure.
It is necessary that the fibers be made of a fiber aggregate in which fibers are partially adhered to each other. The bonding may be performed with an adhesive or a low-melting fiber (adhesive fiber), but from the viewpoint of processing and practical use, the low-melting fiber (adhesive fiber) is preferably used. It can be mixed and used. When a polyester fiber is used as the adhesive fiber, a core-sheath composite fiber having a high-melting polyester such as polyethylene terephthalate as a core and a low-melting polyester copolymerized with isophthalic acid or the like as a sheath is used. can do. The mixing ratio (adhesive fiber / main fiber) of such an adhesive fiber and the main fiber constituting the base material is 5/95 to 6
0/40 is preferable, and 20/80 to 50/50 is more preferable. If the mixing ratio of the adhesive fibers is less than 5% by weight, the adhesion is not sufficient, and the elasticity and hardness are lost. Sufficient adhesion can be provided if the adhesive fibers are contained or mixed at the most at 60% by weight.

As the bonding means, a method such as drying, pressure, heat or the like can be adopted, but a welding means by heat is preferably used from the viewpoint of simplicity of processing. In this case, as the adhesive fiber, the melting point of the main fiber is preferably 2 mm.
It is preferable to use a fiber made of a polymer having a melting point lower by 0 to 150 ° C.

Further, from the standpoint of sound absorbing performance and handleability, the density of the base material of the sound absorbing material of the present invention is 0.02 g / cm ^3.
It is necessary to be above. If it is less than 0.02 g / cm ³ ,
For example, when viewed in terms of the normal incidence sound absorption coefficient, there is a phenomenon that the sound absorption coefficient in a low frequency region of 2000 Hz or less is significantly deteriorated.
I can not achieve my purpose. In addition, since the texture is soft, the form is not stable, and the form is not strong. Therefore, there is a problem that the form is lost during water absorption or on-site work, so that it is difficult to use. The density is 0.06 g in terms of sound absorption.
/ Cm ³ , it is preferably 0.06 g / cm ³ or less from the viewpoints of sufficient performance, cost and production efficiency.

In the present invention, the fibers constituting the base material and the skin material are preferably synthetic fibers from the viewpoint of weather resistance and are composed of the same type of polymer. This is because the use of materials of the same system improves the recyclability and facilitates disposal even after use.

As such a fiber material, any of polyester type, polyamide type, acrylic type, polypropylene type, polyethylene type and the like can be used. However, in order to maintain weather resistance, handleability during construction and sound absorption performance. It is most preferable to use a polyester-based fiber from the viewpoint of bulkiness.

The skin material used in the present invention is preferably colored. Since it is used as a sound-absorbing material for roads, railways, buildings, and the like, it is preferable to have excellent landscape properties, because it is made similar in color or has a pattern according to the surrounding colors. As a method of coloring the skin material, a method of kneading fine particles such as carbon and titanium or a pigment into the fiber itself constituting the skin material, a method of dyeing the skin material, and attaching a pigment such as paint of a desired color to the skin material Any method may be used.

Further, the skin material and the base material used in the present invention need to be integrated as a sound absorbing material. Even if the skin material is integrated with the base material surrounded in a bag shape, It may be bonded, but for efficient production, it is preferable that the skin material and the base material are bonded. At this time, the adhesive layer is preferably made of the same polymer as the skin material from the viewpoint of recyclability and flame retardancy.

The adhesive used for the adhesive layer may be in any form as long as it is made of the same type of polymer as the skin material, and may be a so-called adhesive or a heat-adhesive material. . Further, the heat-adhesive material may be in the form of a film, in the form of a nonwoven fabric, in the form of a web, or even in the form of a powder or granular resin itself. Good.

In the case of a powdery or granular heat-adhesive resin, it may be attached and heat-bonded when the skin material and the base material are bonded. Further, the powdery or granular heat-adhesive resin may be attached and adhered to a skin material or the like in advance, or the heat-adhesive resin may be attached in a dot shape.

Of course, the skin material may be provided on one side, on both sides, or on all sides of the base material with respect to the base material.

The thickness of the fiber used for the sound absorbing material of the present invention is as follows:
1 to 100 dtex can be used.

[0025] Thick fibers have less water retention when wet and can be quickly recovered to a dry state, which is a normal state, and are also preferable in terms of air permeability. Those with 22 dtex are preferably used. Thickness is better from the viewpoint of processability and handleability, and 3 to 15 dtex is more preferably used in consideration of improving productivity with a fiber opening machine. In addition, from the viewpoint of sound absorption, it is better to be thin, especially in the low range of 200 to 200.
In order to improve the sound absorption at 1500 Hz, it is preferable to use thin fibers of 5.5 dtex or less. As for the usage of such fibers, it is preferable to set the fineness and combination to be used and the arrangement thereof in accordance with the required sound absorbing effect.

The fibers to be used may be filaments or staples.
~ 100 mm is preferred.

The cross section of the fiber has a normal round cross section,
Either T-shaped or flat shaped cross sections may be used, and hollow fibers may be used. In addition, a fiber having crimping may be used. For example, the crimped form may be any of a corrugated shape, a spiral type or a compromise type of both, and a spiral type is preferably used from the viewpoint of elasticity and sag resistance. . If the number of shrinkage is small, the elasticity and hardness are insufficient, and if it is too large, trouble occurs in processing.
Crests / 25 mm, more preferably 7 to 15 crests / 25 mm are used.

The thickness of the base material of the sound-absorbing material of the present invention increases as the thickness increases, but from the viewpoint of economy, easiness of handling and space as the sound-absorbing material, it is preferably 5 to 500 mm, more preferably 20 to 500 mm. A 200 mm one is used. Here, in order to achieve the required sound absorbing performance, the sound absorbing material used for constructions such as roads and railways, which is an object of the present invention, is preferably used in a thickness of 50 to 120 mm.

For example, as shown in Table 1, specific gravity 0.0
In the case of 4 g / cm ³ , the normal incidence sound absorption coefficient is considered to be 90% or more in the middle wave region, and to obtain a good sound absorption coefficient of 90%, a thickness of 50 mm or more is required. It is understood that a sound absorption coefficient of 94% or more can be obtained by setting the thickness to 80 mm or more.

[0030]

[Table 1]

The base material used in the present invention is prepared by mixing a main fiber and an adhesive fiber with a cotton opener and a spreader, and then setting the web on a card machine, polymerizing and laminating with a cross layer to form a web laminate. Can be produced by means of dissolving the bonded fibers with an air-through type heat treatment machine, or a method of heat-treating the fibers which have been opened and mixed into a mold by using high-pressure air.

The sound-absorbing plate of the present invention is processed into a wall shape or a panel shape for installation on a road or railroad construction using the above-described sound-absorbing material. It is a structure that considers landscape and safety.

[0033]

The present invention will be described in more detail by way of examples.

The evaluation method used in the present invention will be described. Evaluation methods not described here are basically J
Follow the method specified in IS.

Aeration: Measured according to JIS L-1096.

Sound absorption coefficient: Measured according to JIS A-1405. However, the measuring device used was an automatic normal incidence sound absorption coefficient measuring device type 10041A manufactured by Denshi Sokki Co., Ltd.

Burning performance: Measured according to JIS D-1201.

However, the humidity was controlled at 22 ° C. × 50% RH.

The test piece was 350 mm long, 100 mm wide,
The one having a thickness of 12 mm was used. The sound absorbing material test piece had a thickness of 1 cm, and the sound absorbing material of Example 1 and Comparative Examples 1 and 2 used was a material in which a skin material was laminated on a base material having a thickness of 1 cm.

Water repellency: Measured according to the shower method of JIS L-1096. Example 1 First, a substrate was prepared as follows.

As fibers to be used, polyester staple raw cotton (6.6 decitex, fiber length 64 mm, hollow section, shrinkage of 12 ridges / 25 mm, shrinkage degree 20%, three-dimensional shrinkage product) and adhesive fibers Polyester staple core-sheath type composite fiber (using polyester polymer for the core,
Isophthalic acid copolymerized polyester at sheath temperature 1
One having a polymer of 10 ° C., 4.4 dtex, fiber length 51 mm) was prepared.

The former and latter fibers were determined to be 70/3.
A web was formed with a card at a ratio of 0, and a plurality of the webs were further laminated and heat-treated at a temperature of 170 ° C.
you create a fiber assembly having a thickness of 10cm in m ^3.

A 1.0% by weight water-repellent agent (Asahigard AG-3001 manufactured by Asahi Glass Co., Ltd.) was adhered to a polyester spunbonded nonwoven fabric colored gray with a basis weight of 50 g / m ^2. This was used as a skin material. The ventilation rate is 120 cc / cm ² / se
c.

The performance of the skin material was as shown in Table 2, and it was at a level that simultaneously satisfied the water repellency and the flame retardancy.

This skin material was made into a bag shape by heat-sealing the gusset part with an ultrasonic sewing machine.
The sound absorbing material was created by inserting the base material created earlier into it.

The performance of this sound absorbing material was high as shown in Table 2. Comparative Example 1 A sound absorbing material was prepared in the same manner as in Example 1, except that the polyester spunbonded nonwoven fabric used in Example 1 which had not been treated with a water-repellent agent was used as the skin material.

As shown in Table 2, the performance of the skin material was as follows.
The grade of water repellency was 1, and it did not have water repellency, and could not be used as a skin material of the sound absorbing material. Comparative Example 2 The same process as in Example 1 was carried out except that the polyester spunbonded nonwoven fabric used in Example 1 was provided with a water repellent comprising an acrylic fluorine compound at 1.0% by weight and used as a skin material. It was created.

The performance of the skin material is as shown in Table 2.
The flame-retardant performance showed flammability and could not be used as a skin material of the sound absorbing material. Example 2 Using the raw cotton used in Example 1, a web was formed from these two fibers with a card at a ratio of the former / the latter = 60/40,
After laminating a plurality of sheets, a thickness of 5 cm and a density of 0.040 g /
A fiber aggregate of cm ³ was prepared.

Further, a polyester spunbond nonwoven fabric colored gray with a basis weight of 130 g / m ² was added with a water repellent (Asahigard AG-3001 manufactured by Asahi Glass Co., Ltd.) of a fluorine-containing compound having a urethane bond in an amount of 1.0% by weight. ,
0.2% by weight of a water repellent made of an acrylic fluorine compound (Asahigard AG-7000, manufactured by Asahi Glass Co., Ltd.)
10% by weight of a flame retardant (phoscon D-19) is adhered,
It was a skin material. The air permeability of this skin material is 27 cc / cm ²
/ Sec.

The performance of this skin material was as shown in Table 2, and had sufficient water repellency and flame retardancy.

Using the skin material and the base material, a nonwoven fabric (Dynac sheet G9035 manufactured by Kureha Tech Co., Ltd.) is sandwiched between the skin material and the base material, and the skin material is iron-bonded with heat. A sound absorbing material was created.

The sound absorbing performance of this sound absorbing material was as shown in Table 2, and had excellent sound absorbing performance.

[0053]

[Table 2]

[0054]

According to the present invention, good sound absorption, workability, weather resistance, form stability, strength, workability, mounting workability,
It is possible to provide a sound absorbing material that satisfies flame retardancy, air permeability, and the like, and a technique for efficiently producing a sound absorbing plate using the same.

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Claims (6)

[Claims] 1. A skin material having a basis weight of 30 g / m ² or more and treated with a fluorine-containing compound having a urethane bond, a skin material having a density of 0.02 g / cm ³ or more, and fibers each other. A sound-absorbing material characterized by comprising a substrate made of a fiber assembly partially adhered. 2. The sound-absorbing material according to claim 1, wherein said base material and said skin material are composed of the same polymer. 3. The sound-absorbing material according to claim 1, wherein said skin material is a long-fiber nonwoven fabric in which fibers are partially bonded to each other. 4. The sound absorbing material according to claim 1, wherein said skin material is colored. 5. The sound-absorbing material according to claim 1, wherein said skin material and said base material are adhered to each other, and said adhesive layer is made of a polymer of the same system as said skin material. . 6. A sound absorbing plate comprising the sound absorbing material according to claim 1.