JPS5929432B2 - sound insulation sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lace-like sound insulating sheet having translucency.

In recent years, noise countermeasures have been taken up as a social issue, and factories,
Soundproofing materials are used not only at construction sites, but also in urban areas and homes, and synthetic resin sheets containing solid powder with a high specific gravity are becoming more widely used due to their soundproofing properties, processability, and workability.

However, synthetic resin sheets containing a large amount of metal or metal compounds for the purpose of increasing areal density completely lose the transparency of the base material, such as the synthetic resin.
It has a black or gray color and is unsuitable for interior decoration applications such as sound insulation and chits.Also, when used as a soundproof cover for machinery, etc., it does not have translucency, so it cannot be observed from the outside as it is. This has some inconveniences, such as not being able to do so. Furthermore, sound insulation sheets with translucent properties have already been provided, such as sound insulation sheets made of threads made of metal coated with polymer and a resinous matrix, or sheets made of glass powder or glass fiber mixed with thermoplastic resin. However, it has a poor design and is not suitable for use as soundproof curtains that also serve as interior decoration. The present invention relates to a sound insulation sheet that improves the drawbacks of conventional sound insulation sheets, has excellent sound insulation properties and translucency, and is capable of changing designs with various elaborate designs. The gist is that a transparent or semi-transparent surface material is laminated on at least one side of a lace-like base material made of a polymer material and a metal or metal compound with a specific gravity of 4 or more to give a specific gravity of 1.5 or more. It is what it is.

Although a detailed explanation will be given below based on the drawings, the present invention is not limited to this example.

FIG. 1 is a partial perspective view showing an example of a sound insulating sheet according to the present invention.

The base material 1 is characterized by having a lace pattern, such as a flower pattern, a lattice pattern, an arabesque pattern, a polka dot pattern, a geometric pattern, etc., as long as the pattern is dense enough not to impair translucency.
It is not limited.

Furthermore, various types of polymeric substances can be used for the present base material. Examples include resins such as polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, polystyrene, acrylic resin, phenol resin, urea resin, copolymer resins thereof, and elastomers such as natural rubber, synthetic rubber, and polyurethane. .
Examples of metals or metal compounds with a specific gravity of 4 or more added to these polymeric substances include metals such as copper, zinc, chromium, molybdenum, manganese, iron, lead, and nickel, or complexes thereof, barium, etc. Among the compounds of the added metal, such as oxides, carbonates, and sulfates, chemically stable ones can be mentioned.

Further, its shape may be, for example, powder, fiber, foil, etc., and is not particularly limited. Furthermore, this base material contains
Inorganic fillers such as clay and talc fiber, halogen compounds,
Flame retardants such as antimony oxide, molybdenum oxide, aluminum hydroxide, antioxidants, heat stabilizers, anti-blocking agents, plasticizers, colorants, stabilizers, pigments, antistatic agents,
Diluents such as mineral spirits are added as necessary.

Note that the specific gravity of the base material obtained as described above must be at least 15, preferably 2 or more, for the purpose of obtaining excellent sound insulation properties.

If it is more than 15, it will not be possible to obtain a suitable areal density in the present base material in the form of a lace, and therefore the sound insulation will be poor and the object of the present invention will not be achieved.

Further, the amount of the metal or metal compound added to the polymeric substance is arbitrarily selected depending on the contents of the compound, but it is usually preferably about 300 to 1200 parts by weight per 100 parts by weight of the polymeric substance.

If it is too small, it will not be possible to obtain a specific gravity of 15 or more for the base material, and if it is too large, it will result in poor workability, strength, etc. Surface material 2
is a transparent or translucent sheet, and may be, for example, a sheet made of any of the above-mentioned resins or a composite thereof. The facing material is laminated on both sides or one side of the designed lace-like base material by a known method such as thermocompression bonding. By using a transparent or translucent sheet as the surface material, translucency is obtained in conjunction with the voids of the lace-like base material, making it visible. Furthermore, by laminating the surface material and the base material, the surface material sheet eliminates air permeability, and at the same time, the base material having a high surface density exhibits an excellent sound insulation effect. FIG. 2 is a partial perspective view of another embodiment of the present invention. It is made by reinforcing a lace-like base material with fibers etc. 3 to the extent that transparency is not impaired. Although there are no particular limitations on the method for manufacturing the sound insulation sheet of the present invention, for example, filling the indented portions of a roll with an intaglio pattern on its surface with a paste-like synthetic resin compound, After curing by heating, the resin composition is continuously transferred onto a transparent or semi-transparent synthetic resin sheet, or a paste-like resin compound is applied onto pre-woven fibers into a mesh pattern to create any lace-like shape. There is a method in which the resin is continuously adhered through a cylindrical screen having a pattern passed through it, the resin is heated and cured, and then a transparent or translucent synthetic resin sheet is thermocompression bonded to both or one side of the resin. The sound insulation sheet obtained in this way not only has excellent sound insulation properties as seen in the examples, but also has appropriate light transmission properties, so it can be used in machines that require observation from the outside. Not only is it very convenient for applications such as soundproof curtains, but the lace-like pattern made of the resin compound can be designed and colored in a variety of ways, so it can be used as soundproof curtains for windows, soundproof partitions, etc. It is also ideal as a sound insulating material for interior decoration purposes.

Furthermore, the sound insulating sheet obtained according to the present invention is highly flexible and can be cut, cut, high-frequency welded, bonded, etc., and is therefore excellent in workability. The present invention will be explained below based on Examples. Example. Using paste-like vinyl chloride resin having the composition shown in Table 1, a base material having a lace pattern as shown in Fig.
The thickness of both sides of the base material is 0.4m7!
Heat-pressed with a surface material mainly composed of polyvinyl chloride with transparency of L, thickness 1.6wz1, areal density 2.4kg/
A sheet named M2 was obtained.

The results of measuring the sound transmission loss of the obtained sheet by the reverberation chamber method are shown in FIG. 4A.

The measurement method is to treat a room with a size of 200 m3 or more as a reverberation room, and place a soundproof box (1200 x 1200 x 12
00md) with an opening on one side so that the sound insulation sheet can be attached to the opening, and 100dBA white noise is emitted from the corner of the room, which is regarded as a reverberation room, and inside the soundproof box. The noise level was measured through a microphone installed in the box with and without the sound insulation sheet attached to the open surface of the soundproof box, and the difference between the two was read.

Four sheets of surface material are heat-pressed and stacked one on top of the other, resulting in a thickness of 16m7! L
FIG. 4B shows the results of measuring the sound transmission loss using the same sheet as in the previous example.

As is clear from the results shown in FIGS. 4A and 4B, the use of the sound insulation sheet according to the present invention shows excellent sound insulation performance at all frequencies.

In addition, when a soundproof curtain for a drainage pump was made using this sheet, the operating state of the pump could be clearly observed from the outside, proving that it is sufficiently practical.

[Brief explanation of the drawing]

1 and 2 are partial perspective views of a sound insulating sheet according to the present invention. FIG. 3 is a plan view of the lace-patterned base material used in the example of the present application, and FIG. 4 is a table of measurement results showing the sound insulation properties of the example of the present application and the comparative example. Code 1 is a lace-like base material, 2 is a cover material,
3 is a reinforcing material, and 4 is a void.

Claims (1)

[Claims] 1. A transparent or semi-transparent surface material is laminated on at least one side of a lace-like base material made of a polymeric substance and at least one metal or metal compound with a specific gravity of 4 or more to give a specific gravity of 15 or more. Sound insulation sheet.