JPH08151703A - Transparent soundproof and damping board - Google Patents

Abstract

PURPOSE: To improve the economical effect and construction workability, by combining a transparent plate with a plate made of a transparent elastic material like rubber to make a transparent, soundproof and damping board. CONSTITUTION: Transparent plates A, B that polymerizing monomer made of acrylic acid ester as a chief component is polymerized and cured, are combined together on the surface of a rubberlike elastic material 1 like acryl boards to make a transparent, soundproof and damping board 10. The transparent plates A, B are combined and joined together by a fastening tool, an adhesive, or a tape. Moreover, the loss tangent rises as the thickness of the rubberlike elastic material 1 is increased to improve the capacity of transparent, soundproof and damping board 10 but the maximum loss tangent should be 0.1 or more at the range of 20-50 deg.C in order to get a good soundproof property.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soundproof and vibration-damping plate which is preferably installed in a place where noise and vibration countermeasures are required and at the same time it is desired to secure good scenery, visibility and sunshine along the railway line.
Specifically, it relates to a soundproof and vibration damping plate for automobile roads or railways.

[0002]

2. Description of the Related Art It is well known that conventionally, most common soundproof plates are inorganic materials such as concrete, metal and glass. In recent years, as noise countermeasures have become more important, it has been desired to construct a soundproof wall that is higher than before and higher than the user's line of sight. However, metal or concrete noise barriers have the drawbacks that they do not have a clear field of view for users and hinder the sunshine along the railway lines.Therefore, I want to secure safety, lightness, light transmittance, and scenery with regard to noise barriers. The demand for is increasing significantly.

From a characteristic point of view of the soundproof material, although metal and concrete have sufficient strength and sound insulation,
It is heavy, poor in workability, expensive and opaque.
Further, the glass has a serious difficulty in safety such as being broken into pieces by the impact of flying stones.

On the other hand, a transparent resin plate represented by an acrylic resin plate and a polycarbonate plate is also used in a small part, but it is excellent in light transmittance and transparency, has a small specific gravity, and has the advantage of being easy to process. The former has a defect that it is brittle, while the latter has a defect that its appearance tends to change with time (yellowing). In addition, both of them have low specific gravity and thus have poor sound insulation.

As a solution to such a problem, for example, in Japanese Examined Patent Publication No. 59-45509, there is provided a composite plate obtained by adhering a transparent resin plate with a polymer (adhesive composition) obtained by polymerizing a specific monomer. Although proposed, this method has new drawbacks such as a complicated manufacturing method, complicated handling during construction, and difficulty in bending.

Regarding the sound insulation property, the patent describes that "the adhesive composition obtained can convert vibration energy into heat energy over a wide temperature range by properly using the monomers or plasticizers used." However, the high temperature range (20 ~
There is no mention of sound insulation at 50 ° C.

[0007]

DISCLOSURE OF THE INVENTION The present invention overcomes the disadvantages of conventional concrete and metal such as opaque, heavy and poor workability, and at the same time improves vibration reduction. By simultaneously providing soundproofing and damping in the high temperature range (20 to 50 ° C), the soundproofing and damping functions are both excellent and safe,
The purpose of the present invention is to obtain a transparent soundproof and vibration damping plate that is economical and easy to work with.

[0008]

Means and Action for Solving the Problems The present inventors have
After intensively studying the above issues, soundproofing (sound insulation),
We have come to find a transparent soundproof vibration damping plate that has excellent vibration damping properties, is easy to manufacture and install, and is highly safe.

That is, according to the present invention, a transparent plate (A) and a transparent plate (B) having a transparent rubber-like elastic material on the surface are combined and bonded, and the temperature is in the range of 20 to 50 ° C. The transparent soundproof vibration damping plate is characterized in that the maximum value of the loss tangent is 0.1 or more.

The transparent soundproof and vibration-damping plate of the present invention is further characterized in that (A) is a transparent plate, and (B) is an acrylic resin plate or an acrylic resin-coated polycarbonate plate with acrylic acid on the surface. A transparent plate obtained by polymerizing and curing a polymerizable monomer whose main component is an ester, or a transparent plate having polyvinyl butyral adhered to it, that has been subjected to bending, that for roads or railways. It also includes being used as a soundproof and vibration damping plate.

The transparent plate (A) which is one of the constituent elements of the present invention is a so-called transparent resin such as an acrylic resin,
Vinyl chloride resin, polystyrene, transparent HIPS, MB
It is selected from the group consisting of an S resin, polyethylene terephthalate, polycarbonate (PC), polyarylate, a single or multi-layered sheet made of a cyclic olefin polymer, or those obtained by subjecting these to a surface treatment.

Next, the transparent plate (B) having a transparent rubber-like elastic material on the surface means the olefin elastomer, styrene elastomer, acrylic resin on one or both sides of the transparent plate (A) or partially. One or more transparent elastic bodies selected from elastic bodies such as polymers, polyurethanes, ethylene / vinyl acetate copolymers, vinyl chloride copolymers and polyvinyl butyral are directly adhered by an adhesive or polymerization. Further, such a rubber-like elastic body is preferably a cross-linked type rather than a so-called straight polymer in view of thermal history during post-processing or actual use.

An example of the case where the rubber-like elastic body is adhered by the polymerization adhesion method will be described below. One of the main components is a polymerizable monomer liquid, for example, acrylic acid ester (butyl acrylate as an example), in a mold having a desired shape. In addition to the above, the addition of selected monofunctional and polyfunctional monomers such as methyl methacrylate, styrene, ethylene glycol dimethacrylate, etc. is charged, and it is brought into contact with the transparent plate and then heated. By performing the operation, the polymerization reaction proceeds, and the molding is performed, and at the same time, the adhesion to the transparent plate is performed.
At this time, the shape of the rubber-like elastic body can be arbitrarily selected,
It is desirable to decide it in consideration of the volume and type of the sound of the source.

FIG. 1 shows an embodiment of the transparent plate (B). In the figure, 1 is the rubber-like elastic body, 2 is the transparent plate as described above, and 3 is a transparent plate (B) constituted by these. As in this example, a resin transparent plate (B) having a partially transparent rubber-like elastic body 1 on the surface of the transparent plate 2
Has an advantage that bending by heating can be performed very easily, as compared with a transparent plate having a rubber-like elastic body on the entire surface.

FIG. 2 is a sectional view showing an embodiment of the transparent sound-damping and damping plate of the present invention in which the transparent plate (A) and the transparent plate (B) are combined and joined as described above. 2A is a flat plate, and FIG. 2B is a bent plate. Bending as shown in FIG. 2B has the advantages that the strength of itself is increased and that the diffracted sound of the sound after reaching the soundproof plate can be reduced. Incidentally, in order to combine and bond the transparent plates (A) and (B), various methods such as a method of tightening with a jig, a method of using an adhesive, a method of winding a side portion with a tape can be adopted. still,
The method of combining (A) and (B) by joining has an advantage that when (A) and (B) are separated or shifted, they can be performed more easily than those bonded.

In the transparent sound-damping and damping plate made of the above-mentioned bonded body, the loss tangent (tan δ) can be increased by increasing the thickness of the elastic body, which is the object of the present invention, especially in summer. 2 for good soundproofing
The maximum value of tan δ in the temperature range of 0 to 50 ° C. is 0.
1 or more is required.

The transparent sound-damping and damping plate of the present invention obtained as described above exhibits excellent sound-proofing properties and vibration-damping properties in addition to transparency, safety and ease of manufacture and handling. Further, since the transparent sound-damping and damping plate of the present invention is one in which the transparent plates (A) and (B) are joined together, it can be easily separated as compared with the adhesive type and is also advantageous in reuse. It has the feature.

The transparent soundproof and vibration damping plate of the present invention is preferably installed in a place where noise and vibration countermeasures are required and at the same time, transparency is required. Here is an example: Since the transparent sound-damping and damping plate of the present invention is excellent in light transmission, it does not spoil the scenery even if it is installed in a position higher than the height of the line of sight of the passenger in FIG.
There is no need to alienate the sunshine along the line.

[0019]

The present invention will be described in more detail with reference to the following examples.

In the following examples, the loss tangent (tan)
For the measurement of δ), a dynamic viscoelasticity measuring device (DVE-V4FT Rheospectler / Rheology Co., Ltd.) was used, and a bending mode,
It was performed at a vibration frequency of 110 Hz in a temperature range of -50 ° C to 100 ° C.

The vibration damping property was measured by measuring the loss coefficient (η) with a loss coefficient measuring device (cantilever type, non-contact). For sound insulation, a sound insulation effect measurement system (measurement frequency range: 50 Hz to 10 kHz, sample: 20 cm square) is used to measure the sound pressure level on the sound source side and for each 1/3 octave band after the sample is transmitted, and the difference is sound insulation. Effect (unit: dB)
And

[Example 1] 48 g of butyl acrylate,
48 g of methyl methacrylate, 4 g of ethylene glycol dimethacrylate, 20 g of an oligomer of butyl acrylate (number average molecular weight of 1,000) and a polymerization initiator (0.6 g of L-ascorbic acid, 0.75 g of vanadium salt of methyl acetoacetate (and ethyl), A polymerizable solution composed of diisopropylbenzene hydro-peroxide (0.3 g) was prepared, placed in a resin container 20 shown in FIG. 4 under a nitrogen atmosphere, and adhered to the surface of the solution with a width of 1
An acrylic resin sheet having a length of 0 mm, a length of 50 mm, and a thickness of 2.5 mm was placed on it, and the polymerization and curing reaction was performed at room temperature for 12 hours.

An acrylic resin sheet having a rubber-like elastic body (acrylic polymer) mounted on the surface obtained as described above is further fitted with an acrylic resin sheet of the same size so that the rubber-like elastic body is in the middle. Then, the optical properties and viscoelastic properties of the obtained partially adhered / bonded body were measured. As a result, the total light transmittance was 91%, the haze value was 0.9%, ta
nδ (maximum value at 20 to 50 ° C) was 0.26.

A test piece was prepared by the same method using an acrylic resin sheet having a width of 15 mm, a length of 200 mm and a thickness of 2.5 mm, and the loss coefficient was measured to obtain a loss coefficient (η) of 0.11. It was

The sound insulation effect at 100 Hz is 49d.
It was B. The results are shown in Table 1.

Comparative Example 1 The 2.5 mm thick acrylic resin sheet containing no rubber-like elastic material in Example 1 had good total light transmittance of 93% and haze value of 0.3%, but tan δ. (Maximum value at 20 to 50 ° C.) was 0.04, which was remarkably inferior in viscoelastic property (tan δ).

The loss coefficient (η) was 0.06. Furthermore, the sound insulation effect (100 Hz) measured by stacking two 2.5 mm thick acrylic resin sheets was 41 dB.

Example 2 The same as Example 1 except that an acrylic resin coating (average thickness 80 μm) polycarbonate sheet (2.5 mm thick) extruded by a coextrusion sheet molding machine was used in place of the acrylic resin sheet. The total light transmittance is 89% and the haze value is 1.0.
%, Tan δ (maximum value at 20 to 50 ° C.) 0.28, loss factor (η) 0.13, sound insulation effect (100 Hz) 47 dB
A partially bonded / joined body was obtained.

[Example 3] In Example 2, instead of using the acrylic polymer, a polyvinyl butyral film (ESREC film, 1.9 mm thickness / made by Sekisui Chemical Co., Ltd.) was used, and the acrylic resin coating was used. The surface of the PC sheet was heated to 120 ° C., pressed, and then bonded to obtain a partially bonded / bonded body. This product has a total light transmittance of 88%, a haze value of 1.2%, and a tan δ (20 to 50 ° C.
Maximum value of 0.21).

The loss coefficient (η) was a large value of 0.19. The sound insulation effect (100Hz) is 48dB
Met.

[Example 4] The same procedure as in Example 3 was repeated except that the poly (vinyl butyral) film and the acrylic resin-coated polycarbonate sheet having the same size were used, to obtain a full-surface bonded / bonded body. The performance of this one is
Total light transmittance 88%, haze value 1.3%, tan δ (2
Maximum value from 0 to 50 ° C) 0.34, loss coefficient (η) 0.2
2. The sound insulation effect (100 Hz) was 54 dB.

Comparative Example 2 The acrylic resin-coated polycarbonate sheet used alone in Example 2 had a total light transmittance of 89%, a haze value of 0.9%, and a tan δ (maximum value of 20 to 50 ° C.) of 0.02. The loss factor (η) was 0.02 and the sound insulation effect (100 Hz; two sheets were stacked) was 34 dB.

[0033]

[Table 1]

[0034]

As described above, the transparent soundproof and vibration-damping plate of the present invention having a maximum loss tangent (tan δ) of 0.1 or more in the temperature range of 20 to 50 ° C. is particularly suitable for the summer season. It has excellent soundproofing (sound insulation) and vibration damping at high temperatures, is easy to manufacture and install, has high safety, and has good light transmittance.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a transparent plate (B) having a transparent rubber-like elastic body on the surface according to the present invention.

FIG. 2 is a cross-sectional view showing an example of one embodiment of the transparent soundproof and vibration damping plate of the present invention.

FIG. 3 is a schematic diagram showing an installation example when the transparent soundproof and vibration damping plate of the present invention is used for a railway.

FIG. 4 is a diagram showing a resin container into which a polymerizable solution shown in Examples is injected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rubber-like elastic body 2 Transparent plate 3 Transparent plate (B) 4 Transparent plate (A) 10 Transparent soundproof and vibration damping plate 20 Resin container 21 Polymerizable solution injection part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Hamada 1-3-1 Yokou, Kawasaki-ku, Kawasaki-shi, Kanagawa Asahi Kasei Corporation

Claims (4)

[Claims] 1. A transparent plate (A) and a transparent plate (B) having a transparent rubber-like elastic material on the surface are combined and bonded together, and the maximum loss tangent in a temperature range of 20 to 50 ° C. A transparent soundproof and vibration damping plate having a value of 0.1 or more. 2. (A) is a transparent plate, and (B) is a acrylic resin plate or an acrylic resin-coated polycarbonate plate, and is polymerized with a polymerizable monomer containing an acrylic ester as one of the main components. The transparent soundproof and vibration-damping plate according to claim 1, which is a transparent plate cured or a polyvinyl butyral bonded transparent plate. 3. The transparent soundproof and vibration-damping plate according to claim 1 or 2, which is bent. 4. The transparent sound-damping plate according to claim 1, which is used as a sound-damping plate for roads or railways.