JP3512134B2 - Laminated structure with soundproofing and vibration control - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproofing / damping-resistant laminated structure, and more particularly to a structure requiring soundproofing / damping treatment (for example, a rail rail or an automobile floor panel,
(Other bridge members, etc.), by sequentially laminating a foam sheet layer having closed cells and a urethane powder elastic layer containing rubber powder on the surface thereof, for example, when vibration is transmitted to the structure. The present invention relates to a laminated structure in which solid vibration and radiated sound (solid propagating sound) radiated from the air are efficiently reduced, and a laminate used for the soundproofing / vibration suppressing treatment.

[0002]

2. Description of the Related Art Conventionally, with regard to noise prevention technology for trains and the like, solid vibrations of railway rails and iron bridges generated when trains pass through and solid propagation noises from the vibrations, or vehicle vibrations on highways, etc. There is a growing demand for so-called soundproofing / vibration treatment to reduce solid vibrations from concrete / iron composite bridges and solid-borne sound generated from the bridges when passing, and countermeasures are being taken. It is necessary to further study the noise countermeasures for the various bridges. Furthermore, recently, speeding up of trains has been attempted for a while, and noise prevention technology is becoming more and more necessary.

Therefore, as a countermeasure against such train noise, for example, "a rail for vibration reduction in which a quick-curing urethane resin is sprayed onto a predetermined portion of the surface of a railroad rail and is cured at room temperature to cover an elastic body" (Japanese Patent Laid-Open No. Hei 10 (1999) -242242). No. 6-81301), or `` By using urethane elastomer, by specifying the covered portion of the rail and its thickness, especially by making the thickness of the rail bottom portion 1.5 to 3.0 times that of other portions, vibration A soundproof rail in which noise in a relatively low frequency range in which waves are hard to attenuate is attenuated has been proposed (see JP-A-6-88302).

On the other hand, as a measure against indoor noise when a vehicle is running, "a floor having a high foaming ratio and a low or non-foaming layer laminated on a car floor panel, which is a sound radiation source, has a vibration damping effect. A "structure" is known (see Japanese Patent Laid-Open No. 2-220981).

[0005]

[Means for Solving the Problems] As a result of intensive research conducted by the present inventors on soundproofing and damping treatment of railway rails, automobile floor panels, and other bridge members, which is not inferior to the above-mentioned publicly known technology, an experiment was conducted. H-shaped steel shown in Fig. 1 as a model (width 125 mm, length 1000 mm, height 250 mm, thickness 1a and bottom 1b 9mm, abdomen 1c 4mm) 1
First, a foam sheet layer having closed cells is attached to the lower surface A of the upper portion 1a, the upper surface B of the bottom portion 1b, and the both side surfaces C of the abdomen portion 1c as coating portions, and then on the foam sheet layer. When a urethane-based elastic body layer containing a rubber powder having a specific particle diameter was coated and then noise and vibration attenuation measurements were performed, it was found that solid vibration and solid propagation sound were significantly attenuated and reduced, and the present invention was achieved. It came to completion.

That is, according to the present invention, a structure requiring soundproofing / vibration control; a foam sheet layer having closed cells attached to a predetermined portion of the structure; and a foam sheet layer formed on the foam sheet layer. Another object of the present invention is to provide a soundproofing / vibration-resistant laminated structure comprising a urethane-based elastic layer containing rubber powder having a particle size of 50 to 1000 μm. In the laminated structure of the present invention, a laminate composed of the foam sheet layer and the rubber-powder-containing urethane-based elastic layer used for soundproofing / damping treatment also constitutes a part of the present invention. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The soundproof and vibration-suppressed laminated structure according to the present invention is similar to, for example, a railroad rail in FIG.
H-shaped steel 1 shown in (A) (and FIG. 1) (for simplicity,
After attaching the foam sheet layer 2 to a predetermined position (shown in a diagram without adding thickness) (see A, B and C in FIG. 1) via a normal adhesive or pressure-sensitive adhesive (not shown) It is produced by forming a urethane powder elastic body layer 3 containing rubber powder (hereinafter referred to as rubber powder containing urethane elastic layer) 3 on the foam sheet layer 2 (see FIG. 2B). In addition, in FIG.
As shown in (C), a rubber powder-containing urethane elastic layer or a layer 4 excluding the rubber powder may be interposed in place of the above-mentioned adhesive or pressure-sensitive adhesive. The vibration effect is further improved. When applied to an automobile floor panel, as in the case of the H-section steel, if necessary, a rubber powder-containing urethane elastic layer or a layer excluding the rubber powder is interposed on the predetermined panel surface, and then foamed. The body sheet layer and the rubber powder-containing urethane elastic layer may be sequentially laminated.

The adhesive or pressure-sensitive adhesive is not limited in kind as long as the foam sheet layer can be attached to a predetermined structure. For example, urethane type, epoxy type, chloroprene type, acrylic type, nitrile rubber type, S
Examples include BR-based and cyanoacrylate-based adhesives, and polyvinyl ether-based, polyisobutylene-based, butyl rubber-based, chloroprene rubber-based and other pressure-sensitive adhesives. When an adhesive is used, a quick-curing adhesive is particularly preferable for construction. . In addition,
When an adhesive is used, it may be applied to the foam sheet layer in advance and then attached at the construction site.

As the foam sheet layer 2, any foam sheet having closed cells and impermeable to air can be used. For example, a foaming ratio of 1.2 to 10 can be used.
Double, preferably 1.5 to 3 times polyethylene foam,
Examples thereof include polyurethane foam and polyvinyl chloride foam. The thickness is usually 1 mm or more, preferably 2 to 10 mm
It has only been selected in. If the thickness is less than 1 mm, the effect of attenuating and reducing solid vibration and solid propagation sound tends to be low.

The above-mentioned rubber powder-containing urethane elastic layer 3 is a two-component urethane-based curing material comprising a base component containing, for example, a polyol component and rubber powder having a particle size of 50 to 1000 μm, preferably 200 to 400 μm, and an isocyanate curing agent. It can be formed by applying a conductive composition and curing at room temperature. Incidentally, such rubber powder-containing urethane elastic layer 3
Therefore, it is important that the rubber powder having the above-mentioned predetermined particle size is contained, and if the rubber powder has a particle size of less than 50 μm,
For manufacturing reasons, it is difficult to obtain a finely divided homogeneous rubber powder at low cost, which is not practical. On the other hand, if it exceeds 1000 μm, the nozzle may be easily clogged when spray coating is performed, or the coating surface layer may be uneven and the appearance may be impaired. The content of the rubber powder may be usually selected from 20 to 60% by weight, preferably 30 to 50% by weight of the main component of the two-pack type urethane curable composition. The content is 20
If it is less than 60% by weight, the effect of reducing solid vibration and solid-borne sound tends to be low, and if it exceeds 60% by weight, the viscosity of the composition tends to be high and the coating workability tends to deteriorate. . The rubber powder-containing urethane elastic layer 3 is usually set to have a thickness of 0.5 mm or more, preferably 1 to 10 mm, and a Shore A hardness of 40 to 80, preferably 60 to 80. If the thickness is less than 0.5 mm,
The effect of attenuating and reducing the solid vibration and the sound propagated by the solid tends to be low. If the Shore A hardness is less than 40,
Although it has the effect of attenuating and reducing solid vibration and solid propagation sound, the surface adhesion of the rubber powder-containing urethane elastic layer becomes stronger, and dirt is more likely to occur due to dust adhesion.
Wear resistance and impact resistance are liable to decrease.
When it exceeds, the effect of damping the solid vibration tends to be low.

Examples of the polyol component added to the main component of the above-mentioned two-pack type urethane curable composition include, for example, at least two active hydrogen group-containing compounds (ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, etc.) in the molecule. 1,3-butanediol, 1,4-butanediol, 4,4'-dihydroxydiphenylpropane, 4,4'-dihydroxydiphenylmethane, glycerin, 1,2,6-hexanetriol,
Polyether polyol obtained by addition-polymerizing alkylene oxide (ethylene oxide, propylene oxide, butylene oxide, etc.) to at least one kind of 1,1,1-trimethylolpropane, pentaerythritol, sorbitol, sucrose, etc .; Other polytetra Methylene ether polyol; polymer polyol; polybutadiene polyol; polyester polyol and the like,
If necessary, ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, triethylene glycol, tripropylene glycol, 1,3-butanediol, 1,4-butanediol, bishydroxyethylhydroquinone, glycerin, Castor oil, 1,2,6-hexanetriol, 1,1,1-trimethylolpropane,
Polyhydric alcohols such as pentaerythritol and diglycerin may be added.

On the other hand, examples of the above-mentioned isocyanate-based curing agent include 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or a mixture thereof, crude tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate or 2,4. ′ -Diphenylmethane diisocyanate or a mixture thereof,
Polymethylene polyphenyl polyisocyanate (crude diphenyl methane diisocyanate), xylylene diisocyanate, hexamethylene diisocyanate, dicyclohexyl methane diisocyanate, isophorone diisocyanate, hexahydroxylylene diisocyanate, or other polyisocyanate; or by reaction of said polyol component with an excess of said polyisocyanate Examples thereof include urethane isocyanate prepolymers containing terminal isocyanate groups (NCO) (usually NCO content 5 to 30% by weight). The amount of the isocyanate-based curing agent used is usually selected so that the NCO / OH ratio is 1.0 to 4.0, preferably 1.0 to 1.8 with respect to the polyol component in the base resin. .

Further, one or both of the above-mentioned main agent and isocyanate-based curing agent, if necessary, a usual additive,
For example, fillers (calcium carbonate, perlite, clay, talc, barium sulfate, carbon black, vinyl chloride resin, glass, silica, etc.); plasticizers (dioctyl phthalate, dibutyl phthalate, diheptyl phthalate, diisononyl phthalate, butylbenzyl phthalate, tris). Aromatic carboxylic acid esters such as trioctyl mellitic acid and triisodecyl trimellitic acid; Aliphatic carboxylic acid esters such as dioctyl adipate, diisodecyl adipate, octyldecyl adipate, dioctyl azelate, dioctyl sebacate; tricresyl phosphate and the like Phosphate ester-based plasticizers; other chlorinated paraffins, alkylbenzenes, etc .; Hygroscopic agents (synthetic zeolites, etc.); Curing accelerators (lead octylate, tin octylate, dibutyltin) Organic acid metal soaps such as urate, lead naphthenate, cobalt naphthenate, dimethyltin dichloride, bismuth octylate, dibutyltin diacetylacetonate, dibutyltin silicate, diisopropoxytitanium diacetylacetonate; N-alkylmorpholine, N-alkyl Tertiary amines such as piperazine, triethylenediamine, N, N, N ', N'-tetramethylethyldiamine, etc.); other thixotropic agents (fine silica powder, bentonite, etc.), organic solvents (toluene, xylene, aliphatic carbonization) Hydrogen, etc.), colorants (titanium oxide, carbon black, etc.) and the like may be added in appropriate amounts.

Appropriate compounding examples of the two-pack type urethane curable composition which can be used in the present invention are listed below. Main agent weight% polyol component 30 to 80 rubber powder 20 to 60 filler 0 to 50 plasticizer 0 to 20 hygroscopic agent 0 to 10 curing accelerator catalyst 0 to 5 other additives 0 to 10 curing agent weight% polyisocyanate and / or 80 -100 Terminal NCO-containing prepolymer Plasticizer 0-20 Filler 0-20 Curing acceleration catalyst 0-5

[0015]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. Example 1 In this example, the laminated structure shown in FIG. 2B is manufactured. (1) Preparation of two-component urethane curable composition Main component (parts by weight) No. 1 No. 2 Castor oil [functionality (f) = 2.7, molecular weight 1000] 41 41 Rubber powder (particle size 180 ~ 355 μm) 45-Hygroscopic agent (synthetic zeolite) 5 5 Curing acceleration catalyst [Sanko Machine Co., Ltd., Stan 918] 0.5 0.5 Other additives 8.5 8.5

Curing agent parts by weight Crude diphenylmethane diisocyanate (Sumitomo Bayer Urethane Co., Ltd., crude MDI, NCO content 31.5% by weight) --- 45 NCO-containing urethane prepolymer (Note) --- 43 Plasticizer (butyl Benzyl phthalate) ---- 12 Note) Reaction product of polyether polyol and excess crude diphenylmethane diisocyanate, urethane prepolymer containing terminal isocyanate group manufactured by Sumitomo Bayer Urethane Co., NCO content 9% by weight. Powder included) and curing agent 2.3 / 1
In a weight ratio of (NCO / OH≈1.68). The Shore A hardness of the cured product in this case is 67. In addition, in the case of the above main agent No. 2 (without rubber powder), 1.3%
When mixed at a weight ratio of 1/1 (NCO / OH≈1.64), the Shore A hardness of the cured product is 60.

(2) Manufacture of laminated structure subjected to soundproofing / damping treatment A two-part urethane adhesive (Penguin seal 571A, manufactured by Sunstar Giken Co., Ltd.) was used at a predetermined location on the H-shaped steel 1 to have a thickness of 3 mm. Then, after the polyethylene foam 2 having a foaming ratio of 1.5 times is attached, a two-pack type urethane curable composition using the main ingredient No. 1 of the above (1) is spray-painted on the polyethylene foam 2 to cure at room temperature. Thus, the rubber powder-containing urethane elastic layer 3 having a thickness of 2 mm is formed.

Example 2 In this example, the laminated structure shown in FIG. 2C is manufactured.
A two-part urethane curable composition containing the base material No. 1 of Example 1 / (1) was spray-coated on a predetermined portion of the H-shaped steel 1 to a thickness of 1 mm, and before being hardened, The polyethylene foam 2 with a thickness of 3 mm used in Example 1 was crimped,
Then, a rubber powder-containing urethane elastic layer 3 having a thickness of 1 mm is formed on the polyethylene foam 2 in the same manner as above, and is cured at room temperature.

Comparative Example 1 H-shaped steel 1 was coated with a tar epoxy coating in an amount of 150-
It is applied in a thickness of 200 μm. Comparative Examples 2 and 3 H-steel 1 was spray-coated at a predetermined location with a two-component urethane-based curable composition using the base material No. 1 of Example 1 / (1), and was cured at room temperature to have a thickness of 3 mm. (Comparative example 2) or 5
mm (Comparative Example 3) having a rubber powder-containing urethane elastic layer formed thereon.

Comparative Example 4 A two-component urethane curable composition containing the base material No. 2 of Example 1 / (1) was spray-coated on a predetermined portion of the H type steel 1 at room temperature to give a thickness of 5 mm. A urethane elastic layer containing no rubber powder (see JP-A-6-81301).

Comparative Example 5 In the laminated structure of Example 2, the upper and lower rubber powder-containing urethane elastic layers 3 and 4 were respectively the same 1 mm thick urethane elastic layers containing no rubber powder as in Comparative Example 4. What I did.

<Noise / Vibration Measurement Test> The laminated structures of Examples 1 and 2 and Comparative Examples 1 to 5 were tested for the soundproofing / damping effect under the following conditions. Note that the experiment was conducted in an anechoic room in consideration of the influence of the sound reflected from the surrounding walls. Measurement conditions Normal sound level meter: dB (A), 8500Hz Vibration acceleration: 1/3 octave band, 60-8500
Hz Vibration source: Continuous impact collision by tapping machine Excitation point: Diagonal center point (α point) of the upper surface A ′ of the upper portion 1a of the H-shaped steel 1 shown in FIG. 1, or 30 mm in the lateral width direction from the α point.
Parallel-moved point (point β) Measurement position: In the case of noise measurement, 1 m in the horizontal direction from the diagonal center point (point X) of the side surface C of the abdomen 1c of the H-shaped steel 1 shown in FIG.
Alternatively, the measurement is performed at a position separated by 2 m and at a position separated by 1 m in the vertical direction from a diagonal center point (not shown) on the lower surface of the lower portion 1b. In the case of vibration measurement, the pickup accelerometer is brought into contact with the X point. taking measurement.

The results of noise measurement are shown in Tables 1 and 2 below.

[Table 1]

[Table 2] The results of vibration measurement (only for Example 2 and Comparative Examples 1 to 3) are shown in FIG. 3 when the excitation point is α point and in FIG. 4 when the excitation point is β point.

[0024]

According to the above test results, first, in the case of solid-borne sound, the present invention (Examples 1 and 2) is about 3 even when compared with Comparative Examples 3 to 5 in which the total laminated thickness (5 mm) is the same. A sound reduction effect of about -5 dB is recognized, and as for solid vibration, Example 2 is significantly attenuated in a low vibration region (60 to 250 Hz), which is particularly important for vibration pollution, as compared with Comparative Examples 1 to 3. The effect (about 5 to 10 dB) is recognized. Since the present invention has a foam sheet layer (for example, polyethylene foam) unlike Comparative Examples 3 and 4, the thickness of the rubber powder-containing urethane elastic layer 3 can be reduced, in other words, the rubber. It can be said that the number of times of spraying at the time of forming the powder-containing urethane elastic layer is small, which is advantageous in simplifying the process.

As described above, a rubber sheet-containing urethane elastic layer or a layer excluding the rubber powder is formed on a structure requiring soundproofing / vibration treatment, if necessary, and then the foam sheet layer and the rubber sheet-containing layer are contained. Although a specific example of producing a desired laminated structure by sequentially laminating urethane elastic layers has been described, if a laminate of two or three layers having these predetermined thicknesses is produced in advance, such a laminate will be produced in the future. Is a study subject of
It is understood that the present invention can be easily applied to various existing bridges and the like, and thereby a desired soundproofing / damping effect can be achieved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an H-section steel used as an experimental model of a structure to be treated in the present invention.

FIG. 2 shows a specific example of a soundproofing / damping-processed laminated structure of the present invention, in which (A) is an H-shaped steel, (B) is an example of the laminated structure, and (C) is another example. It is a simplified front view which shows an example.

FIG. 3 is a graph showing the results of vibration measurement performed on the laminated structures manufactured in Example 2 and Comparative Examples 1 to 3 when the excitation point is α point.

FIG. 4 is a graph showing the results when the excitation point in the vibration measurement similar to FIG. 3 is β point.

[Explanation of symbols]

1: H type steel 2: Foam sheet layer 3: Rubber powder-containing urethane elastic layer

─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-2-227452 (JP, A) JP-A-8-326599 (JP, A) JP-A-6-81301 (JP, A) JP-A-6- 88302 (JP, A) JP-A-2-220981 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (6)

(57) [Claims] 1. A structure requiring soundproofing / vibration suppression; a foam sheet layer having closed cells, which is attached to a predetermined position of the structure; and a particle size formed on the foam sheet layer. A soundproofing / vibration-resistant laminated structure comprising a urethane-based elastic layer containing rubber powder of 50 to 1000 μm. 2. The laminated structure according to claim 1, wherein the structure requiring soundproofing / vibration suppression treatment is one kind selected from railway rails, automobile floor panels, and bridge members. 3. A foam sheet layer is laminated structure according to claim 1 or 2 are adhered via an adhesive or pressure-sensitive adhesive. 4. A foam sheet layer is, in place of the adhesive or pressure-sensitive adhesive, to claim 1 or 2 are adhered via a layer other than the urethane-based elastic layer or a rubber powder of rubber powder containing The laminated structure described. 5. A thickness of 1 mm or more and a foaming ratio of 1.2 to 1
A foam sheet layer having 0 times the number of closed cells; and a urethane powder formed on the foam sheet layer, which has a thickness of 0.5 mm or more and a Shore A hardness of 40 to 80 and a particle diameter of 50 to 1000 μm. A soundproofing / vibration suppressing laminate comprising an elastic elastic layer. 6. A urethane-based elastic body layer is coated with a two-component urethane-based curable composition comprising a base component containing a polyol component and a rubber powder having a particle size of 50 to 1000 μm, and an isocyanate-based curing agent, and at room temperature. The laminate according to claim 5, which is formed by curing.