JPH116234A - Vibration-damping and sound-insulating sheet, method for producing the same, and vibration-damping and sound-insulating flooring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration-damping and sound-insulating sheet having excellent sound-proofing performance in a high frequency range and having a good walking feeling, a method for manufacturing the same, and a vibration-damping and sound-insulating floor material. SOLUTION: It comprises a binder component having a resin component or a rubber component as a main component, a high specific gravity filler, and a sound absorbing filler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration-damping and sound-insulating sheet used for sound-insulating a house or the like, a method of manufacturing the same, and a vibration-damping and sound-insulating floor material.

[0002]

2. Description of the Related Art In recent years, as the number of wooden floors and multi-family houses has increased, demands for preventing floor noise from being transmitted to lower floors in apartment houses and general single-family houses have been increasing. ing. As one measure for preventing such floor noise, a vibration-damping and sound-insulating sheet or a soundproofing material is used between the floor below the upper floor and the ceiling below.

[0003] As a vibration damping and sound insulating sheet, for example,
No. 65777 proposes a sheet in which a high specific gravity filler is added to asphalt. When this sheet is used in a house, it is laid on a base material such as plywood, and a wooden floor is constructed thereon.

[0004] However, in the above vibration damping and sound insulating sheet,
Due to the low sound absorption in the high frequency range, the sound insulation was insufficient for adapting to the above applications. Also, if a foam sheet or non-woven sheet with a thickness of several millimeters is installed under a wooden floor in order to enhance the sound insulation performance in the high frequency range, the amount of distortion due to compression increases, and the walking feeling becomes worse. was there.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vibration-damping and sound-insulating sheet having excellent soundproofing performance in a high frequency range and a good walking feeling, a method of manufacturing the same, and a vibration-damping and sound-insulating flooring material.

[0006]

The vibration-damping and sound-insulating sheet of the present invention is characterized by comprising a binder component containing a resin component or a rubber component as a main component, a high specific gravity filler and a sound absorbing filler.

Hereinafter, the present invention will be described. The specific gravity of the high specific gravity filler used in the present invention is preferably 2 or more,
More preferably, it is 4 or more. When the specific gravity is less than 2, it is difficult to impart sufficient vibration damping and sound insulating properties to the obtained vibration damping and sound insulating sheet.

Examples of the high specific gravity filler include iron sand, iron powder, iron oxide, calcium carbonate, zircon sand,
Examples include chromite sand, iron-made slag powder, silica sand, lead powder, tin oxide, zinc oxide, barium sulfate, iron sulfide, mica, aluminum hydroxide, talc, clay, and the like.

As the properties of the high specific gravity filler, any of powder, fibrous and scaly can be used, but powder is preferable for mixing with other components. The particle diameter of the high specific gravity filler is preferably 2 mm or less, more preferably 5 mm or less.
μm to 500 μm. If the particle size exceeds 2 mm, it becomes difficult to mix uniformly, and the performance of the obtained vibration damping and sound insulating sheet may become uneven.

The above resin component or rubber component is used as a binder component. As the resin component, a thermoplastic resin is preferable, for example, vinyl chloride, polypropylene,
Examples include polyethylene and acrylic resins.

As the rubber component, those which are not vulcanized are preferable. For example, natural rubber, SBR (styrene butadiene rubber), NBR (nitrile butadiene rubber), C
R (chloroprene rubber), BR (butadiene rubber), I
Non-vulcanized products such as R (isoprene rubber) are exemplified.

When the above-mentioned resin component or rubber component is used as a binder component, an emulsion is preferable in terms of easy formation of a vibration-damping and sound-insulating layer. Examples of the emulsion include an acrylic resin emulsion and a vinyl acetate resin. Emulsions, vinyl chloride ester copolymer emulsions, SBR emulsions, NBR emulsions, etc., may be used alone or in combination of two or more.

The resin component and the rubber component may be added with a processing aid such as a plasticizer, a thickener, a gelling agent, etc., for adjusting viscosity, and a pigment.

The amount of the binder component is preferably 0.5 to 30 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the high specific gravity filler. When the amount is less than 0.5 part by weight, the high specific gravity filler is not sufficiently retained by the binder component, and the strength of the obtained vibration damping and sound insulating sheet may be insufficient. The vibration-damping and sound-insulating properties of the vibration-insulating sheet may be reduced.

The sound-absorbing filler used in the present invention is used for improving the sound-absorbing property in a high-frequency range, and examples thereof include powdery or granular porous substances and hollow substances. Examples of the porous substance include inorganic balloons such as shirasu balloon, fly ash balloon, and pearlite powder;
Pulverized or finely divided organic foams such as urethane, polyethylene, polypropylene, polyvinyl chloride, polystyrene, and phenol are preferably used.

As the hollow material, for example, inorganic beads such as glass beads and hollow ceramics; resin hollow beads such as styrene, polycarbonate and polypropylene are preferably used.

The specific gravity of the sound absorbing filler is 0.01 to
A range of 1.5 is preferred. If the specific gravity is less than 0.01, it is crushed in the manufacturing process of the vibration damping and sound insulating sheet, and the sound absorbing effect is hardly exhibited, and if it exceeds 1.5, the sound absorbing effect becomes small.

The particle size of the above sound absorbing filler is 5 μm to 5 μm.
mm is preferred. When the particle diameter is less than 5 μm, the sound absorbing effect is small, and when it exceeds 5 mm, the strength of the vibration damping and sound insulating sheet is weakened, and the vibration damping and sound insulating sheet may be broken during handling.

The amount of the sound absorbing filler varies depending on the specific gravity of the filler itself, but is preferably 0.01 to 15 parts by weight based on 100 parts by weight of the high specific gravity filler. The amount is
If the amount is less than 0.01 part by weight, the sound absorbing effect becomes small, and if the amount exceeds 15 parts by weight, the vibration damping and sound insulating sheet becomes lighter, so that the whole sound insulating performance may be reduced.

When producing the vibration damping and sound insulating sheet of the present invention, a method of mixing a resin emulsion or a rubber emulsion with a high specific gravity filler and a sound absorbing filler and adding water as a dispersant to form an aqueous slurry. preferable. At this time,
For the purpose of adjusting the viscosity, processing aids such as plasticizers, thickeners, and gelling agents; pigments and the like may be added.

If the viscosity of the aqueous slurry is too low or too high, it is difficult to control the coating thickness, so that the viscosity is preferably 3,000 to 30,000 cps. Further, in order to stabilize the thickness after coating, a water-crosslinkable gelling agent (for example, urethane prepolymer) is added to the aqueous slurry.

The urethane prepolymer used as the above-mentioned gelling agent is a prepolymer containing a terminal NCO group obtained by reacting a polyol with a polyisocyanate, and reacts with water to form a crosslinked product.

Examples of the polyol include polyoxyalkylene polyols such as polyethylene glycol and polypropylene glycol; polyester polyols, polycaprolactone polyols, dimer acid ester polyols, polycarbonate polyols, butadiene polyols, acrylic polyols, ethylene-vinyl acetate copolymers And chloroprene polyol.

Examples of the above polyisocyanate include tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl isocyanate (C-MDI), hexamethylene diisocyanate, xylylene diisocyanate (X
DI), isophorone diisocyanate, hydrogenated XD
I, hydrogenated MDI and the like.

The urethane prepolymer is preferably hydrophilic in consideration of dispersibility in an aqueous slurry. As the polyol component, for example, polyethylene glycol and polypropylene glycol are contained in a molar ratio of 85:15, and as the isocyanate component, tolylene diisocyanate (TDI) and / or diphenylmethane diisocyanate (MDI) are contained,
Prepolymers having a terminal NCO ratio of about 5 mol% are preferred.

The molecular weight of the above prepolymer is usually from 800 to 30,000 in weight average molecular weight (Mw).
0, more preferably 2,000 to 20,000.
0, and a number average molecular weight (Mn) of 500 to 1
000 is preferred, and more preferably 800 to 8.0.
00.

In order to improve the handling strength of the vibration-damping and sound-insulating sheet, a sheet-like face material may be laminated on at least one surface thereof. As the sheet-like face material, for example,
A nonwoven fabric, a foamed sheet or the like is suitably used, but from the viewpoint of handling strength, a nonwoven fabric made of synthetic fibers is preferable. Examples of the synthetic fibers include synthetic fibers such as nylon, polyester, polyethylene, and polypropylene.

As a method for producing the above-mentioned synthetic fiber non-woven fabric, any method such as a spun bond method, a melt blow method, a flash spinning method, a tow opening method and a burst fiber method may be used.

The basis weight of the synthetic fiber nonwoven fabric is 10 to 1
The range is preferably 50 g / m ² , more preferably 20 g / m ^2.
８０80 g / m ² . The basis weight is 10 g / m ²
If it is less than 150, the sheet-like face material may be broken at the time of forming the vibration-damping and sound-insulating sheet. If it exceeds 150 g / m ² , the liquid component in the aqueous slurry is not stable and the thickness accuracy is difficult to obtain. .

The thickness of the entire vibration-damping and sound-insulating sheet is 1 to 3
0 mm is preferred, and more preferably 1.5 to 20 mm. If the thickness is less than 1 mm, the vibration-damping and sound-insulating properties may be insufficient, and the production may be difficult. On the other hand, when the thickness exceeds 30 mm, the vibration-damping and sound-insulating sheet becomes too heavy, and the workability may be reduced.

The vibration-damping and sound-insulating sheet can be manufactured, for example, using an apparatus schematically shown in FIG. First,
In a tank 2a equipped with a stirrer 1a, a high specific gravity filler,
Supplying an emulsion of sound absorbing filler and unvulcanized rubber,
If necessary, water is added to prepare an aqueous slurry 3.
The aqueous slurry 3 is transferred from the tank 2a to the tube pump 5
a, the urethane prepolymer 4 is separately transferred from the tank 2b through the tube by the tube pump 5b and supplied to the pipeline mixer 7.
In the pipeline mixer 7, the blades 8 of the stirrer 1 c are rotated to rotate the aqueous slurry 3 and the urethane prepolymer 4.
And mix uniformly.

Next, a mixed slurry 10 in which the aqueous slurry 3 and the urethane prepolymer 4 are mixed is supplied to a coating tank 11 through a pipe, and the sheet-like face material 1 moving below the coating tank 11 in the direction of the arrow is moved. To a predetermined thickness. The coating thickness of the mixed slurry 10 is
The height can be adjusted by changing the height of the knife coater 9 installed in the apparatus. The mixed slurry 10
A traverse machine 15 for reciprocating the discharge port 9 of the mixed slurry 10 in the width direction of the sheet-like face material 1 in order to uniformly apply the sheet-like face material 1 without stagnation in the width direction of the sheet-like face material 1 is provided. You may.

The sheet-like face material 1 is rewound in the direction of the arrow as the roll-like material 21 rotates, and
It is transported while touching 2. The position where the mixed slurry 10 is discharged is preferably on the roll 12. At this discharge position, the application of the mixed slurry 10 is performed in a state where the sheet-like surface material 1 is in contact with the roll 12, so that the sheet-like surface material 1 is bent when the mixed slurry 10 is pressed by the lower end of the knife coater 16. It does not occur, and application with a uniform thickness is possible.

The mixed slurry 10 applied on the sheet-like face material 1 is superimposed on another sheet-like face material 2 rewound from the roll-like material 22 in the direction of the arrow. Further, by pressing the mixed slurry 10 and another sheet-like surface material 2 unwound from the roll-like material 22, a mixed slurry layer (see FIG. No) is obtained. The vibration-damping and sound-insulating sheet is cut into a predetermined size by the take-off cutter 14 with the rolls 17a and 17b, and dried to obtain a product.

In mixing the aqueous slurry containing the emulsion of the unvulcanized rubber with the water-crosslinkable urethane prepolymer, the weight ratio between the solid component of the emulsion and the water-crosslinkable urethane prepolymer in the aqueous slurry is determined by the reaction rate , Molecular weight, temperature, etc., but usually 30: 1.
0.5: 1, more preferably 10: 1
1: 1.

When the weight ratio of the emulsion of the unvulcanized rubber to the water-crosslinkable urethane prepolymer exceeds 30: 1, the shape retention at the time of production may be reduced, and the weight ratio may be 0.5: 1. If the ratio is less than the above, the expression of the vibration damping performance by the unvulcanized rubber may be insufficient.

It is preferable that the mixed slurry is transferred or coated so as not to stay in the piping and the coating tank during the coating. In addition, when there is excess water in the mixed slurry, it is preferable to remove it by drying.

[0038]

Since the vibration-damping and sound-insulating sheet of the present invention contains a sound-absorbing filler, the sound-proofing performance in a high-frequency range can be improved without using a foamed sheet or a thick nonwoven fabric. Since the vibration-damping and sound-insulating floor material of the present invention uses the above-described vibration-damping and sound-insulating sheet, the sound insulating performance in a high-frequency range is enhanced. In the method for producing a vibration damping and sound insulating sheet of the present invention, since a water-based slurry at normal temperature is used, the vibration damping and sound insulating sheet can be formed without destroying the sound absorbing filler. In addition, since the water-based slurry is cross-linked by the water-crosslinkable urethane prepolymer, the sound-absorbing filler having a large buoyancy can be maintained in a uniformly dispersed state in the water-based slurry, thereby stabilizing the quality of the vibration-damping and sound-insulating sheet. Can be.

[0039]

Embodiments of the present invention will be described below. Example 1 Preparation of Aqueous Slurry In a tank 2a of the apparatus shown in FIG. 1, 150 parts by weight of water and an emulsion of non-vulcanized rubber (carboxy-modified SBR emulsion “JSR-0619” manufactured by Nippon Synthetic Rubber Co., specific gravity =
1.0, solids content = 48% by weight), 62 parts by weight, and while being stirred by the stirrer 1a, a high specific gravity filler (iron sand, specific gravity: 4.6, particle size: 200 mesh pass) 1, 0
00 parts by weight, Shirasu Balloon (PB
−30 ”, specific gravity = about 0.2, average particle size about 0.9 mm) 7
2 parts by weight of a thickener (Shin-Etsu Chemical Co., Ltd. methylcellulose “Metroze 90SH30000”) were simultaneously added little by little to obtain an aqueous slurry 3.

The urethane prepolymer polyol component is a mixture containing a ratio of 85:15 of polyethylene glycol and polypropylene glycol at a molar ratio of the isocyanate component is tolylene diisocyanate (TDI), urethane prepolymer (first industrial "Monotac 305" manufactured by Pharmaceutical Co., Ltd., weight average molecular weight 3200, number average molecular weight 1200, specific gravity = 1.1)
It was used.

The above aqueous slurry 3 and urethane prepoly
4 is supplied to the pipeline mixer 7 and stirred and rotated.
Mix and mix at number 1,800 rpm, weight ratio 100: 1
Slurry 10 was prepared. Apply the above mixed slurry 10
It is supplied to the tank 11,
After coating on sheet-like face material 1, on mixed slurry 10 layers
Then, another sheet-like face material 2 was pressed. The above-mentioned vibration damping sound insulation layer,
While picking up by the rolls 17a and 17b, the cutter 14
After cutting into a size of 50cm x 50cm at 80 ° C
After drying for 8 hours, the vibration-damping and sound-insulating sheet (thickness) shown in FIG.
6mm, surface density 14.2kg / m^Two ) Got. In addition,
50 g / m per unit weight for the sheet-like face materials 1 and 2 ^TwoPolyester
Woven fabric was used.

Example 2 High specific gravity filler (iron sand, specific gravity:
4.6, 1,000 parts by weight, emulsion of non-vulcanized rubber (carboxy-modified SBR emulsion “JSR-0619” manufactured by Nippon Synthetic Rubber Co., Ltd.),
Specific gravity = 1.0, solid content concentration = 48% by weight) 73 parts by weight,
Hollow glass beads (glass beads "HSC-110" manufactured by Toshiba Barotini Co., specific gravity = about 1.1, particle size about 10 μm
m) A water-based slurry was prepared in the same manner as in Example 1 from 10 parts by weight, 2 parts by weight of a thickener (Methylcellulose “Shin-Etsu Chemical Co., Ltd. Metrosh 90SH30000”), and 145 parts by weight of water. Next, this aqueous slurry and the urethane prepolymer of Example 1 were mixed at a weight ratio of 100: 1 to obtain a mixed slurry. Using this mixed slurry, a vibration-damping and sound-insulating sheet (thickness: 6 mm, surface density: 12.9 kg / m ² ) was obtained in the same manner as in Example 1. In addition, sheet-like face material 1
, A polyester nonwoven fabric having a basis weight of 50 g / m ² and a sheet nonwoven fabric 2 having a basis weight of 70 g / m ² were used.

Comparative Example 1 A vibration-damping and sound-insulating sheet (thickness 6 mm, surface density 12.8 kg / m ² ) was obtained in the same manner as in Example 1 except that no shirasu balloon was used.

Comparative Example 2 A vibration-damping and sound-insulating sheet (thickness: 6 mm, area density: 15.1 kg / m ² ) was obtained in the same manner as in Example 2 except that no hollow glass beads were used.

The following lightweight floor impact sound levels were measured for the vibration-damping and sound-insulating sheets obtained in the above Examples and Comparative Examples.
Table 1 shows the measurement results. Construction of the vibration-damping and sound-insulating sheet The sound-damping and sound-insulating sheets obtained in the above Examples and Comparative Examples were placed on the second floor of a unit-type 2-by-4 house ("Suzumi Chemical Co., Ltd." Installed. That is, the vibration-damping and sound-insulating sheet 32 is laid on a particle board having a thickness of 20 mm as the floor base material 31 such that the buffer layer is on the lower surface, and the flooring material 33 having a thickness of 12 mm is formed thereon. The flooring material was adhered using a vinyl acetate paste-based adhesive (trade name “Esdine floor tile” manufactured by Sekisui Chemical Co., Ltd.). Further, the butt portion of the flooring flooring material was treated with one 40 mm long finish nail.
Nailing was performed at an interval of 50 mm to obtain a three-layer vibration-damping and sound-insulating flooring material. This vibration-damping sound-insulating floor material was fixed on a floor joist 34. Using the tapping machine, the light-weight floor impact sound level of the vibration-damping sound-insulating floor material constructed on the second floor was measured by a measuring method and sound insulation grade in accordance with JIS A1418.

[0046]

[Table 1]

[0047]

The vibration-damping and sound-insulating sheet of the present invention has the above-described structure, and does not impair walking feeling.
(near kHz). Since the vibration-damping and sound-insulating floor material of the present invention uses the above-described vibration-damping and sound-insulating sheet, the sound absorbing performance in the vicinity of a high-frequency range (1 to 4 kHz) is improved without impairing walking sensation similarly to the vibration damping and sound-insulating sheet. be able to. The method for producing a vibration damping and sound insulating sheet of the present invention includes:
Since the water-based slurry at room temperature is used, it can be molded without breaking the sound-absorbing filler, and by crosslinking the water-crosslinkable urethane prepolymer, it is possible to uniformly retain the sound-absorbing filler having a large buoyancy in the water-based slurry. As a result, the sound absorbing performance near the high frequency range (1 to 4 kHz) can be stabilized.

[Brief description of the drawings]

FIG. 1 is a simplified diagram showing an example of an apparatus used in the present invention.

FIG. 2 is a partially cutaway schematic perspective view showing a use state of the vibration damping and sound insulating sheet.

[Explanation of symbols]

 1, 2 sheet-like face material 2a, 2b tank 3 water-based slurry 4 urethane prepolymer 7 pipeline mixer 9 discharge port 10 mixed slurry 11 coating tank 12, 17a, 17b roll 14 cutter 16 knife coater

Claims (4)

[Claims] 1. A vibration damping and sound insulating sheet comprising a binder component containing a resin component or a rubber component as a main component, a high specific gravity filler, and a sound absorbing filler. 2. The vibration-damping and sound-insulating sheet according to claim 1, wherein the sound-absorbing filler is a porous substance or a hollow substance. 3. An aqueous slurry containing a resin emulsion or a rubber emulsion, a high specific gravity filler and a sound absorbing filler, and a water-crosslinkable urethane prepolymer are mixed, and the resulting mixed slurry is placed on a sheet-like face material. A water-crosslinkable urethane prepolymer, and gelling the water-crosslinkable urethane prepolymer. 4. A vibration-damping and sound-insulating flooring material comprising the vibration-damping and sound-insulating sheet according to claim 1 sandwiched between a floor base material and a floor finishing material.