JPH07279127A - Transparent sound insulating laminated plate - Google Patents

Abstract

PURPOSE:To provide a lightweight sound insulating wall excellent in workability and never injuring a scene by forming a sound insulating wall for express- highway or railroad from a laminated plate having a prescribed beam transmittance obtained by adhering transparent plates through an elastic body so as to provide a continuous space. CONSTITUTION:Transparent plates A, B of acrylic resin are mutually adhered through an elastic body C consisting of a polymer adhesive body mainly containing a methacrylate so as to provide a continuous space, and a laminated plate is formed. In the formation of the laminated plate, full beam transmittance is set to 70-95%, haze value to 0.1-20%, and the loss tangent (tan delta) in a temperature range of 0 deg.C-50 deg.C to 0.05 or more. The laminated plate is set on a road, railroad, or other noise generating place so that the elastic body C is vibrated by a noise, and the vibration is converted into a thermal energy, and attenuated when passed in the continuous space part. Thus, a lightweight transparent plate excellent in sound insulating property can be easily provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transparent soundproofing board which is transparent and has excellent soundproofing performance, and particularly in an area where a private house is close to a railway line or an opaque soundproofing wall may significantly impair the scenery. It is suitable as a soundproof wall for roads or railways.

[0002]

2. Description of the Related Art Inorganic materials typified by concrete have been widely used as soundproof walls.
Especially when transparency is required, transparent plastic materials such as glass and acrylic resin and polycarbonate are used. On the other hand, the importance of noise countermeasures is becoming more important along with the increase in speed on automobile roads and railways.
There is a need for a high performance soundproof wall that is transparent, hard to break, inexpensive and easy to implement.

However, it is hard to say that the existing technology sufficiently meets such a demand. That is, for example, the method using glass has excellent transparency and weather resistance, but it is heavy, and there is concern about the safety when broken. Also,
Acrylic resin, which can be said to be a representative of transparent plastics, is excellent in lightness, weather resistance and cost, but is significantly inferior in impact resistance. On the other hand, although polycarbonate has good impact resistance, it has problems in weather resistance, solvent resistance, cost and the like.

As one of the attempts to solve such a problem, a combination of glass and plastic has been devised. For example, glass / EVA / polycarbonate is lighter and safer than glass,
It cannot be said that the workability and soundproofing are sufficient. In addition, a combination of transparent resins has also been particularly studied. For example, acrylic resin-coated polycarbonate has significantly improved weather resistance as compared with polycarbonate, but in order to impart soundproofing performance with this, the areal density is increased. That is, it is necessary to increase the thickness, which eventually leads to an increase in cost.

Next, as a method for improving the soundproofing property, an adhesive composition limited to a transparent resin as shown in, for example, Japanese Patent Publication No. 59-45509 is injected and polymerized and cured to be integrated. It is a method to make it. With this method, it is possible to improve the sound insulation, but when it is attempted to directly bond the polycarbonates with each other with this adhesive composition, for example, a remarkable whitening phenomenon is caused and the transparency is lost. I will end up. Further, since it is essential to use a limited adhesive composition, there are problems in cost.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention As partially touched upon in the preceding paragraph, when a conventional transparent soundproof plate is to improve soundproof performance while maintaining transparency, a complicated structure or a significant weight increase is required. It is unavoidable and has major problems in terms of practicality. The present invention solves such a problem, and provides a transparent multilayer board which has excellent soundproofing performance and can be reduced in weight.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted extensive studies on the drawbacks and problems of conventional transparent soundproofing plates, and have excellent soundproofing properties as described below, a light weight ratio is possible, and workability is
It has been possible to obtain a transparent multilayer board having good economical efficiency. The present invention is
The components include transparent plates (A) and (B) and an elastic body (C) that adheres them. First, as A and B, a transparent resin such as an acrylic resin, a vinyl chloride resin, a transparent ABS resin, MBS is used. Resin, polystyrene, transparent HIP
A single sheet or a multi-layer sheet (for example, coextrusion of acrylic resin and PC) made of S, poly 4-methylpentene 1, cycloolefin polymer, polyethylene phthalate, polyester resin, polycarbonate (PC), polysarbon, polyarylate, and the like, and It is selected from inorganic glass (plate glass, laminated glass, tempered glass) and the like. still,
The surface of these sheets may be surface-treated with a hard coat or the like for the purpose of improving weather resistance and surface hardness.

The elastic body C is transparent, and A and B are adhered by some method such as heat welding, solvent adhesion, polymerization adhesion, coextrusion or the like. As an example, ethylene / vinyl acetate resin is used. In addition to olefin elastomers, styrene elastomers, acrylic polymers, polyvinyl butyral, etc., polymerizable urethane monomers, acrylic monomers, etc. may be mentioned as examples.

One of the specific examples of the polymerizable acrylic monomer is a mixture of a methacrylic acid ester, an acrylic acid ester and a low molecular weight polymer to which a polymerization initiator is added.
It is also usually called a room temperature curable polymerization adhesive. When attempting to bond by solvent bonding or polymerization bonding, depending on the combination with the transparent plates (A) and (B),
Care should be taken as it may cause a whitening phenomenon. For example, in the adhesion of polycarbonate, it is possible to prevent whitening by using a material whose surface is coated with acrylic resin in advance.

Alternatively, when the polycarbonate is heat-bonded with polyvinyl butyral, it is necessary to use a high molecular weight polycarbonate or to devise an appropriate plasticizer in the polyvinyl butyral. In the present invention, the structure is an important requirement in addition to the above constituents, but it is effective to improve the soundproofing performance by having a space between A and B, which is continuously connected from at least one end. Is.

An example of a structure having this space is shown in FIG.
2 shows. FIG. 1 shows that A and B are bonded by a rectangular C, and FIG. 2 shows that A and B are bonded by four circular Cs. If you want to obtain the desired shape by the polymerization adhesive method, first attach a transparent spacer that matches the shape, inject a polymerizable monomer into it, and superimpose A and B, then By carrying out, the intended laminate can be obtained.

Another advantage of providing such a space is that the amount of C used per area of the plate can be reduced, which is economically advantageous. In this way, the obtained multilayer plate has transparency with a total light transmittance of 70 to 95% and a haze value of 0.1 to 20%, and the vibration energy of the sound is the vibration heat of the elastic body. In order to convert it into energy, it is necessary that the loss tangent (tan δ) is 0.05 or more in the temperature range of 0 ° C to 50 ° C.

The transparent multi-layer board can be suitably used on roads, railways, and other places where noise control measures are required. However, when the areas are different for A and B, the one having a smaller surface area on the sound source side is used. It is essential to point to.

[0014]

In the transparent multilayer board of the present invention, excellent transparency is ensured and the sound whose tan δ value reaches the multilayer board from the sound source is converted into thermal energy by the vibration of the elastic body C. Further, it is attenuated when passing through a continuous space portion from at least one end portion between A and B. Further, since tan δ in the temperature range from room temperature to 50 ° C. is large, it is effective as a noise countermeasure especially in summer.

[0015]

EXAMPLES The loss tangent (tan δ) described in the following examples was measured according to the following method. First, a length of 50 mm and a width of 5 mm as shown in FIG.
A test piece composed of constituent components A, B, and C having an arbitrary thickness (8 mm or less) is prepared.

Next, this test piece was mounted on a dynamic viscoelasticity measuring device (DVE-V4FT Rheospectler, Rheology Co.), and the loss tangent (at a bending mode vibration frequency of 110 Hz and a temperature range of -50 ° C to 100 ° C). tan δ) was measured. The total light transmittance and haze value are JISK70.
The measurement was performed according to 15. The performance of each example is shown in Table 1.

[0017]

Example 1 A PET film (50 mm × 10 mm) was bundled between two 2.5 cm thick acrylic resin plates (Delagrass A manufactured by Asahi Kasei Kogyo Co., Ltd.) to form two 1.6 mm thick spacers. 10 from the opposite sides as shown in 4
Arrange them so that they are parallel to each other by a distance of mm, and wrap them around the edges of the three sides with cellophane tape so that they cannot leak even if liquid is added. In it, 48 g of butyl acrylate,
An acrylic polymerizable monomer prepared by mixing 32 g of methyl methacrylate (0.5 g of L-ascorbic acid, 0.75 g of cobalt naphthenate, 0.3 g of cumene hydroperoxide) is injected. 20 to 30 of this
A transparent laminate having good adhesiveness was obtained by allowing it to stand at room temperature for 24 hours. The spacer was removed and the total light transmittance and haze were measured to be 90 each.
% And 0.9%.

Next, the upper 5 mm of this cube was cut laterally with a precision cut-sewn and put on a dynamic viscoelasticity measuring device.
When the loss tangent (tan δ) was measured in the bending mode,
The minimum tan δ value was 0.07 and the maximum tan δ value was 0.20 in the temperature range of 0 ° C. to 50 ° C.

[0019]

Comparative Example 1 The total light transmittance and haze of the acrylic resin plate used in Example 1 alone were 91% and 0.8%, respectively. The tan δ value from 0 ° C to 50 ° C is 0.0
It was between 4 and 0.06.

[0020]

Example 2 In Example 1, a coextrusion sheet having an acrylic resin layer of 100 μm is used as the surface layer portion of polycarbonate (Teijin Kasei K-1285) produced by a coextrusion sheet forming apparatus instead of the acrylic resin plate. Other than the above, the same operation was performed, and the total light transmittance was 89% and the haze was 0.9.
%, The tan δ value from 0 ° C to 50 ° C is 0.06 to 0.
A good transparent multilayer board in the range of 35 was obtained.

[0021]

Comparative Example 2 The coextruded sheet having 100 μm of the acrylic resin layer on the surface layer of the polycarbonate used in Example 2 had a total light transmittance and a haze of 89% and 0.9%, respectively, and had excellent transparency, but at 0 ° C. The tan δ value from 0 to 50 ° C. was a low value of 0.01 to 0.02.

[0022]

Examples 3 to 4 In Example 3, instead of using the acrylic polymerizable monomer of Example 1, a polyvinyl butyral film (S-REC film, Sekisui Chemical Co., Ltd.) was used.
Using 1.9 mm thickness, sandwich the whole with Teflon plate and iron plate,
It was press-bonded at a pressure of 10 kg / cm ² and 120 ° C. for 20 minutes.

In Example 4, EVA was used instead of polyvinyl butyral in Example 3; Dumilan film F3
No. 00 (Takeda Pharmaceutical Co., Ltd.) 1.9 mm thick was used to perform the adhesion in the same manner. As shown in Table 1, all the data were good results.

[0024]

Example 5 100 parts by weight of polyvinyl butyral resin (degree of butyralization 65 mol%), 40 parts by weight of diisodecyl phthalate, UV absorber 2- (2'-hydroxy-)
14% by weight of 3'-lauryl-5'methylphenyl) benzotriazole was kneaded using a biaxial kneader at 85 ° C for 5 minutes, and then pressed under the conditions of 110 ° C and 150 kg / cm ² to produce a polyvinyl butyral prototype 2 mm. Got thick.

In Example 3, the constituent components were acrylic resin, PC coextrusion sheet (2.5 mm thickness) / glass plate (1 mm thickness) / polyvinyl butyral prototype (2 mm
(Thickness) and the same method was performed to obtain good transparency and tan δ value as shown in Table 1.

[0026]

[Table 1]

[Brief description of drawings]

FIG. 1 shows an example of the structure of a transparent soundproof multi-layer board of the present invention.

FIG. 2 shows an example of the structure of the transparent soundproof multi-layer plate of the present invention.

FIG. 3 shows a loss tangent (ta) of a dynamic viscoelasticity measuring device.
The test piece at the time of measuring n (delta) is shown.

FIG. 4 is an example of a method for producing a transparent sound-insulating multilayer board for tan δ measurement using a polymerizable monomer.

Claims (4)

[Claims] 1. A transparent plate (A), a transparent plate (B) and A, B
Which has an elastic body (C) for adhering as a constituent component and has a space portion continuously connected from at least one end portion between A and B, having a total light transmittance of 70 to 95% and a haze. A transparent soundproof plate having a value of 0.1 to 20% and a loss tangent (tan δ) of 0.05 or more in a temperature range of 0 ° C to 50 ° C. 2. A transparent soundproofing board according to claim 1, wherein A and B are selected from the group consisting of acrylic resin, acrylic resin-coated polycarbonate, and glass, and C is a polymer adhesive having methacrylic acid ester as a main component. . 3. The transparent soundproofing plate according to claim 1, wherein at least one of A and B is polycarbonate and C is plasticized polyvinyl butyral. 4. A soundproof wall for roads or railways according to claim 1, 2, or 3.