JP2873681B2 - Sound insulation sheet for drainage pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation sheet for drain pipes, which covers the outer periphery of drain pipes in order to cut off noise generated in drain pipes of houses and buildings.

[0002]

2. Description of the Related Art Conventionally, in order to cut off a sound generated in a drain pipe of a house or a building, a sound insulating material such as glass wool or rock wool or a sound insulating sheet made of such a sound insulating material is wound around an outer periphery of the drain pipe. Fixing is performed by using a method such as this. Further, a sound insulating material for drainage pipes has been proposed in which a soft sound absorbing material is laminated on the inner periphery of a sound insulating sheet bent in a cylindrical shape, and a split groove is provided in the longitudinal direction. (Japanese Unexamined Patent Publication No. 4-11130)

[0003]

However, the method of wrapping a sound insulating material such as glass wool or a sound insulating sheet around a drain pipe and fixing it with a wire or the like on site requires a lot of work and a sufficient sound insulating effect. I can not say. Also, forming a sound insulation material having a bent groove in a cylindrical shape requires a special process, which increases the cost.In addition, the obtained cylindrical sound insulation material is bulky when stored and transported. In addition, there is a problem that a large amount of space is required as compared with a plate-shaped sound insulating material. An object of the present invention is to solve these problems of the prior art, and to provide a sound insulating sheet for drainage pipes that is low in manufacturing cost, excellent in sound insulating effect, easy to construct, and easy to store and transport without being bulky. And

[0004]

According to the present invention, a vibration-damping sound-insulating sheet layer (b), a fiber sheet layer (c), and a phosphorylated pulp layer (d) are sequentially laminated on the fiber sheet layer (a). This constitutes a sound insulation sheet for drainage pipes. Further, the present invention provides a vibration-damping and sound-insulating sheet layer (b) in which 0 to 100 parts by weight of a thermoplastic polymer and 100 parts by weight of an inorganic filler are added to 100 parts by weight of asphalt.
It is characterized by using a mixture obtained by adding 00 to 2000 parts by weight and mixing uniformly after addition.

[0005]

Embodiments of the present invention will be described below in more detail. The fiber sheet layer of (a) and (c) constituting the drainage pipe sound insulation sheet of the present invention includes:
Various materials such as nonwoven fabric, felt, woven fabric, paper and paperboard can be used, but it is preferable to use nonwoven fabric or felt from the viewpoint of vibration damping and sound insulation effects. Particularly preferred examples include nonwoven fabrics made of synthetic fibers such as polyester, inorganic felt, asphalt felt obtained by impregnating high-mass special paper with asphalt, and kraft paper.

[0006] The vibration-damping and sound-insulating sheet layer (b) constituting the sound-insulating sheet for drainage pipes of the present invention is prepared by adding 0 to 100 parts by weight of a thermoplastic polymer and 100 to 2,000 parts by weight of an inorganic filler to 100 parts by weight of asphalt. Use what was obtained by mixing. When adding a thermoplastic polymer, an inorganic filler may be added to a mixture of asphalt and a polymer in advance. The asphalt to be used is not particularly limited, and those generally called asphalt, for example, natural asphalt and petroleum asphalt such as straight asphalt and blown asphalt are used. These asphalts can be used alone or as a mixture of two or more.

As the thermoplastic polymer, polyolefin, polyvinyl chloride, nylon, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene
Methyl acrylate copolymer, ethylene / ethyl acrylate copolymer, styrene / butadiene copolymer, natural rubber, natural rosin, modified rosin, etc. can be used, especially styrene / butadiene block copolymer is used Is preferred.

As inorganic fillers, metal powders such as iron, copper, lead, tin, zinc, nickel, stainless steel, iron oxide, iron sesquioxide, ferric oxide, ferrite, lead oxide, tin oxide,
Metal oxides such as zinc oxide, copper oxide, and aluminum oxide;
Metal salts such as barium sulfate, calcium sulfate, lead sulfate, aluminum sulfate, calcium sulfite, calcium carbonate, lead carbonate, barium carbonate, magnesium hydroxide, etc., steelmaking slag, mica, clay, talc, zinc white, wollastonite, diatom Soil, silica sand, pumice powder and the like can be used, and these can be used alone or in combination of two or more.

Preferred inorganic fillers include iron powder, various iron oxide powders, steelmaking slag powder, calcium carbonate, calcium bicarbonate and the like. These powders have a particle size of 0.5 mm or less, especially 0.2 mm or less. It is more preferred to use. By using the finely divided inorganic filler as described above, it is possible to improve the moldability in producing the sound insulation sheet for drainage pipes, and to uniformly disperse and mix a large amount of the inorganic filler in the asphalt base material. Thus, the surface density of the vibration-damping and sound-insulating sheet layer (b) can be increased, and the thermal sensitivity of the vibration-damping and sound-insulating sheet layer (b) can be greatly improved. The surface density of the vibration-damping and sound-insulating sheet layer (b) is closely related to the vibration-damping and sound-insulating effect of the sound-insulating sheet for drainage pipes. The higher the surface density, the better the vibration-damping and sound-insulating effect. It is extremely difficult to incorporate a large amount of an inorganic filler therein, and a conventional vibration-damping and sound-insulating sheet layer using an asphalt base material could not obtain a sheet with a large surface density. In the present invention, by using the above-mentioned finely powdered inorganic filler, the areal density is 2.0 kg / m ² / mm or more, preferably 2.5 kg / m ² / mm.
m ² / mm or more, more preferably 2.8 kg / m ² / m
m or more, thereby realizing a drain pipe sound insulating sheet having an excellent vibration damping and sound insulating effect.

The inorganic filler is added in an amount of 100 to 2,000 parts by weight based on 100 parts by weight of asphalt. However, if the amount of the inorganic filler is less than 100 parts by weight, sufficient vibration damping and sound insulation effects cannot be obtained. If it exceeds 2000 parts by weight, the whole will become brittle, and the workability as a sound insulation sheet for drainage pipes will decrease. In the present invention, in order to form the vibration-damping and sound-insulating sheet layer (b), for example, a thermoplastic polymer and an inorganic filler are added to asphalt, and the mixture is uniformly mixed while heating to form a vibration-damping and sound-insulating sheet. The vibration-damping and sound-insulating sheet layer is directly formed between the fiber sheet layers (a) and (c) by laminating with the sheet or by using an asphalt mixture in a heated and molten state. At this time, an adhesive layer may be provided between each layer as needed.

[0011] A sheet obtained by adding an inorganic filler to asphalt becomes fragile as a whole when the amount of the inorganic filler added is large, and the molding processability and workability are extremely poor. ), Fiber sheet (b),
(C) By sandwiching them in a sandwich shape, it became possible to significantly improve the formability and workability of the sound insulation sheet for drainage pipes.

The phosphorylated pulp used as the surface layer (d) of the sound insulation sheet for drainage pipes of the present invention is obtained by condensing condensed phosphoric acid with a wood pulp for papermaking.
The phosphorylated pulp is a material that contains a large amount of an air layer, is lightweight, has sound absorbing properties and flame retardancy, and is widely used as a wallpaper, a decorative board, a fitting, a packaging material, and the like. As the phosphorylated pulp layer (d) of the sound insulation sheet for drainage pipes of the present invention, various shapes can be used. In addition to the phosphorylated pulp processed into a sheet shape, the phosphorylated pulp processed into a corrugated plate, Examples thereof include a sheet processed into a corrugated sheet and a sheet-shaped sheet laminated on one surface, and a plurality of these may be used in appropriate combination. As a preferred phosphorylated pulp layer, a layer obtained by laminating a phosphorylated pulp processed into a sheet shape on one surface of a phosphorylated pulp processed into a corrugated plate may be mentioned. When this laminated sheet is used as the phosphorylated pulp layer (d), the laminated sheet is laminated so that the corrugated sheet surface is on the surface to form a sound insulating sheet for drainage pipes. A plurality of such laminated sheets can be used.

The sound insulation sheet for drainage pipes of the present invention is wound around the drainage pipe so that the phosphorylated pulp layer (d) is in contact with the drainage pipe, and is fixed with a wire, band, adhesive tape or the like. In conventional sound insulation sheets for drain pipes, when winding a thick sound insulation sheet around a drain pipe, the difference between the inner diameter of the sound insulation sheet in contact with the drain pipe and the outer diameter of the outer sound insulation sheet causes the sound insulation sheet to return to its original shape. He tried to come back and peeled off the drain pipe, making it difficult to wind it. In the sound insulating sheet of the present invention, the phosphorylated pulp layer (d) provided on the surface in contact with the drain pipe is flexible and highly elastic. The sound insulation sheet can be wound around the surface of the drain pipe easily because the sound insulation sheet absorbs the difference between the inner and outer diameters of the sound insulation sheet and can be wound around the drain pipe. In addition, the phosphorylated pulp itself is a material having sound absorbing properties, and the phosphorylated pulp layer (d) forms a gap between the drain pipe and the sound insulation sheet substrate by the air layer, thereby providing an impedance difference in spatial sound transmission. And plays a role of effectively extracting the transmission loss value of the sound insulating sheet. In addition, since the air layer also has excellent heat insulating properties, it is possible to prevent dew condensation and freezing of the drain pipe. The sound insulation sheet of the present invention can be easily manufactured using an inexpensive material, so that the manufacturing cost is low, and it can be easily cut and processed with a cutter knife or the like. It can be easily constructed. Further, since the sheets can be stored and transported in a stacked state, the cost for storage and transport can be reduced.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited by the embodiments. (Embodiment) FIG. 1 is a schematic view showing an example of a sound insulating sheet for drainage pipes according to the present invention. In FIG. 1, reference numeral 1 denotes a drain pipe sound insulating sheet, reference numerals 2 and 4 denote polyester nonwoven fabric (fiber sheet layers), reference numeral 3 denotes a vibration damping sound insulating sheet layer, reference numeral 5 denotes an adhesive layer, and reference numeral 6 denotes a phosphorylated pulp layer. In this example, a modified asphalt 1 obtained by mixing a styrene / butadiene block copolymer with a straight asphalt at a ratio of 9: 1 was used.
5 parts by weight, 80 parts by weight of iron oxide powder having a particle size of 0.5 mm or less,
5 parts by weight of calcium carbonate powder having a mesh size of 200 mesh or less are uniformly mixed, and the thickness is 2 mm and the areal density is 2.9 kg / m ² / m.
m Of the vibration-damping and sound-insulating sheet layer 3 described above. As the polyester nonwoven fabrics 2, 4, those having an areal density of 50 g / m ² were used. The phosphorylated pulp layer 6 was formed into a corrugated sheet, and a sheet-like material was laminated on one side to a thickness of 4 m.
m sheets were used. After extruding and laminating an asphalt mixture in a heat-melted state between the polyester nonwoven fabrics 2 and 4 in advance, a normal aqueous acrylic adhesive layer 5 is provided on the surface of the polyester nonwoven fabric 4, and a phosphorylated pulp layer 6 is laminated to a thickness of 10 mm. Was obtained.

As shown in FIG. 2, the drain pipe sound insulation sheet was wound around a polyvinyl chloride drain pipe having an outer diameter of 75 mm, and the results of measuring the vibration damping sound insulation effect are shown below. In FIG. 2, reference numeral 20 denotes a polyvinyl chloride drain pipe, reference numeral 11 denotes a sound insulation sheet for the drain pipe, and reference numeral 16 denotes a phosphorylated pulp layer provided on the surface of the sound insulation sheet 11. Further, reference numeral 17 denotes a joint portion of the sound insulation sheet, and reference numeral 18 denotes an adhesive tape. Since the sound insulating sheet 11 is doubled at the joint 17 of the sound insulating sheet 11, the phosphorylated pulp layer 16 of the sound insulating sheet 11 on the outside is cut off with a cutter knife or the like, and the surface of the joint is fixed with an adhesive tape 18.

As shown in FIG. 2, the sound source room is a toilet on the second floor of a 2 × 4 two-story house in which a sound insulation sheet is wrapped around a drain pipe, and the first floor with a drain pipe on the lower floor is a sound receiving room. FIG. 3 shows the result of analyzing the noise with an octave analyzer using a meter. In FIG. 3, the horizontal axis represents the octave band center frequency (Hz), and the vertical axis represents the sound pressure level (dB).
Represents In FIG. 3, the dashed line B indicates the measurement result when no sound insulating sheet is used, and the solid line A indicates the measurement result when the sound insulating sheet for drainage pipes of the present invention is used. From this result, when the sound insulating sheet is not used, the sound is below the line N-65 and is determined to be grade N-65. However, when the sound insulating sheet is used, the sound is below the line N-55 and the class N-65. It is determined to be -55, and an excellent vibration damping and sound insulating effect is achieved.

[0017]

According to the present invention, on the fiber sheet layer (a),
A sound insulation sheet for drainage pipes is constructed by sequentially laminating a vibration damping sound insulation sheet layer (b), a fiber sheet layer (c), and a phosphorylated pulp layer (d). As the vibration suppression sound insulation sheet layer (b), asphalt 100 weight Thermoplastic polymer in part 0-100
After adding 100 parts by weight and 100 to 2000 parts by weight of an inorganic filler, a mixture obtained by mixing uniformly is used. With such a configuration, the drain pipe sound insulating sheet of the present invention not only has excellent sound insulation and sound absorption properties, but also exhibits a good heat insulating effect, and can prevent freezing and condensation of the drain pipe. In addition, it is excellent in moldability at the time of sound insulation sheet production, and has a large surface density by using a finely powdered inorganic filler.
It is possible to obtain a drain pipe sound insulating sheet having much improved performance as compared with the conventional sound insulating sheet. The sound-insulating sheet for drainage pipes of the present invention can be easily manufactured using inexpensive materials, so that the manufacturing cost is low, the construction is simple, and it can be easily applied to curved pipes and joints. In addition, since the sheets can be stored and transported by stacking them, the cost for storage and transport can be reduced at a low cost, which is extremely practical.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view illustrating an example of a sound insulation sheet for drainage pipes of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating a state in which the drain pipe sound insulation sheet of the present invention is wound around a drain pipe.

FIG. 3 is a view showing the results of measuring the vibration damping and sound insulating performance of the sound insulating sheet for drainage pipes of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Sound insulation sheet for drain pipes 2, 4 Fiber sheet layer 3 Damping sound insulation sheet layer 5 Adhesive layer 6, 16 Phosphorylated pulp layer 17 Sound insulation sheet joint 18 Adhesive tape 20 Drain pipe

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Saburo Yamamoto 180, Kinzoji-cho, Zentsuji-shi, Kagawa Pref. Within Shichio Kogyo Co., Ltd. (72) Inventor Toshiaga Ishii 7-25-13 Horikiri, Katsushika-ku, Tokyo Ishii Trading Co., Ltd. In-company (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 55/02 E03C 1/12

Claims (6)

(57) [Claims] 1. A drain pipe sound insulating sheet comprising (a) a fiber sheet layer, (b) a vibration damping sound insulating sheet layer, (c) a fiber sheet layer, and (d) a phosphorylated pulp layer. (2) a vibration-damping and sound-insulating sheet layer comprising 100 parts by weight of asphalt and 0 to 100 parts by weight of a thermoplastic polymer;
The sound insulating sheet for drainage pipes according to claim 1, wherein the sound insulating sheet is obtained by uniformly mixing 100 to 2000 parts by weight of an inorganic filler after addition. 3. The inorganic filler is one or more selected from the group consisting of metals, metal oxides and metal salts, having a particle size of 0.5 mm or less. The sound insulating sheet for drainage pipes according to claim 1. (4) The areal density of the vibration-damping and sound-insulating sheet layer is 2.
Drainage pipe sound insulating sheet according to any one of claims 1 to 3, characterized in that 0kg / m ² / mm or more. 5. The drainage pipe sound insulation sheet according to claim 1, wherein the phosphorylated pulp layer is processed into a corrugated sheet. 6. The method according to claim 1, wherein (d) the phosphorylated pulp layer is obtained by processing a corrugated sheet and laminating a sheet-like material on one surface. Sound insulation sheet for drainage pipes.