KR100198861B1 - Restricted vibration-damping material - Google Patents

Abstract

Conventional vibration damping materials to block vibration and noise have been used as a vibration damping material by simply laminating a polymer film, sheet or non-woven fabric to the upper layer of the vibration damping composition, but the vibration damping material of the present invention is aluminum foil (1) and A sound-absorbing layer (3) made of a nonwoven fabric or a fiber felt and a chemical pulp paper having high porosity is bonded with a polymer adhesive (2) to produce a three-layered sound absorbing and insulating sheet (A). Is inserted into a lattice pattern using a polymer adhesive to form a vibration and noise scattering layer (B), and a vibration damping layer (C) is placed under it, which is a restraining vibration damper and is flexible and blocks noise and vibration over the entire frequency. It is designed to constitute a multilayered vibration damper with excellent composite structure.

Description

Constrained Composite Vibration Damper

The present invention is used in automobiles, railroad cars, industrial machinery, home appliances, etc. It is a constrained and flexible to absorb and block vibrations and noises and removes them. It is about.

Conventionally, a vibration damping material used to block vibration and noise has been used as a vibration damping material by simply laminating a polymer film, a sheet, or a nonwoven fabric on the upper layer of the vibration damping composition layer. Is a non-constrained type, and it is well known that its performance is inferior in terms of sound insulation and vibration damping performance to that of the constrained vibration damping material.

Therefore, such non-constrained vibration damping materials have been used with limited use because of limitations of sound insulation and vibration damping performance.

In order to make up for these drawbacks, efforts have been made to restrict the vibration damping material, and the asphalt damping pad, aluminum sheet, aluminum foil, etc. are used at the top layer of the vibration suppression composition layer to form a restraining vibration damping material to improve sound insulation and vibration damping performance. Esau has made some progress.

However, these damping materials are also restricted in their use in curved areas such as automobiles, railroad cars, industrial machinery, and home appliances because the restraint plate itself is not flexible, and the damping material itself has a simple structure. Although there is a damping effect, the demand for a new type of vibration damper that is more flexible and able to properly absorb and block noise and vibration over the entire frequency band has been continued.

The present invention is to solve the above problems and to provide a complex type of multilayered vibration damper that can flexibly exhibit an excellent damping effect over the entire frequency band while restricting the vibration damper.

1 is a cross-sectional configuration of the vibration damper of the present invention.

2 is a cross-sectional view showing another embodiment of the present invention.

3 is a cross-sectional view showing yet another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

A: Sound absorption and sound insulation sheet B: Vibration and noise scattering layer

C: damping layer 1: metal foil

2: polymer adhesive 3: sound absorbing layer

4: high strength porous fiber layer 5: vibration damping composition layer

6: polymer film

The present invention for solving the above problems is to help improve the vibration damping between the metal foil (1) having excellent sound insulation performance and the sound-absorbing layer (3) having a high porosity selected from nonwoven fabric, fiber felt, chemical pulp paper. After compounding with the polymer adhesive (2) to produce a three-layered sound absorbing and insulating sheet (A), two or more of the sound absorbing and insulating sheets (A) are laminated, and the carbon between the laminated sound absorbing and insulating sheets (A) The vibration and noise scattering layer (B) is a combination of a high strength porous fiber layer (4) selected from fibers, glass fibers, polyester fibers, etc., and a polymer adhesive layer (2) selected from natural rubber, acrylic, and chlorinated rubber. The lowermost layer is made of a damping additive selected from asphalt, mica, clay, talc, graphite, silica, zinc oxide, and the like, a polymer resin selected from styrene-butadiene-styrene, ethylene vinyl acetate, By providing the vibration damping material are laminated to the vibration damping composition layer (5) and a composite of a polyethylene film damping layer (C) with the vibration damping composition comprising in powder can be achieved.

The positioning of the vertical relationship between the metal foil 1 and the sound absorbing layer 3 in the sound absorbing and insulating sheet A can be changed depending on the purpose of use.

By stacking the sound absorbing and insulating sheets A in various forms as shown in FIGS. 1 to 3, a double sound insulation and a sound absorbing effect can be obtained.

In addition, when the fiber layer of the vibration and noise scattering layer (B) forms a non-uniform structure layer such as a fine pore by inserting a porous fiber of high strength material, the sound waves incident in the Longitudinal Mode Switch to Shear Mode to maximize vibration and noise attenuation effect by sound scattering effect.

For this effect, the high-strength fiber used in the vibration damping material of the present invention inserts the glass wool or carbon fiber treated with the anti-vibration adhesive in a lattice pattern to form a vibration and noise scattering layer (B) having a uniform structure layer. It is inserted into the middle of each sound absorbing and insulating sheet (A) to make a double layer to maximize the vibration and noise damping effect as well as to help increase the stiffness of the vibration damping material itself.

As the metal foil 1 used as the vibration damping material, aluminum foil, copper foil, lead foil, or the like may be used. The thickness of the metal foil 1 may be preferably 8 μm to 30 μm, and the thickness of the metal foil 1 may be increased. If it is less than 8㎛ not expected sound insulation effect, when using more than 30㎛ there is a problem in flexibility.

As the sound absorbing layer 3, a material having a high porosity such as a nonwoven fabric, a fiber felt, a chemical pulp paper, or the like can be used. If the thickness is 100 μm or less, the expected sound absorption effect is not achieved. Since the thickness of the sound insulation sheet A is too thick, there is a problem in working, it is preferable to use from 100 μm to 200 μm.

And the high-strength porous fiber constituting the vibration and noise scattering layer (B) is the most effective to attenuate vibration and noise using glass wool or carbon fiber.

The restraint layer of the vibration damper manufactured in this way is a total of 8 layers, and the thickness of 0.3 mm to 3 mm is the most appropriate thickness for vibration and noise attenuation, and the vibration damping material having the above configuration has different characteristics. By combining heterogeneous sheets and multi-layering the combined sheet layers repeatedly, excellent vibration and noise blocking effects are exhibited at any frequency band, and the upper restraint layer of the vibration suppression composition layer 5 has a composite structure of eight layers. Therefore, it is a vibration damping material having excellent sound insulation and vibration damping performance which cannot be compared with the conventional simple structure type vibration damping material in terms of its performance.

And the vibration damping composition layer 5 constituting the vibration damping layer (C) is selected from various fillers such as mica, clay, talc, graphite, silica, zinc oxide, etc. And it is prepared by mixing the metal powder to improve the sound insulation and to form a fine restrained structure to improve the damping and sound insulation effect.

The method for producing a vibration damping composition is 10 to 30 parts by weight of a thermoplastic resin such as styrene-butadiene-styrene resin, ethylene vinyl acetate resin, and 30 to 200 parts by weight of a vibration damping filler in a mixing tank at about 200 ° C. 10-30 parts by weight of the metal powder is melted and mixed, and pressurized by a press roll when discharged from the tank to form a composite sheet with the restraining layer.

In addition, the lower surface of the vibration suppression composition layer 5 has a polymer film layer 6 to increase workability and productability. The thickness is generally used from 30 μm to 60 μm and the total thickness of the vibration suppression layer is 1.0 mm. The total thickness of the vibration damping material manufactured up to 2.5 mm and combining the restraint layer is 1.5 mm to 3 mm is the most appropriate thickness considering the vibration damping performance and economical efficiency.

The vibration damping material of the present invention manufactured in this way is composed of a total of 10 layers, showing excellent vibration and noise attenuation effects in any frequency band, and in addition to the vibration damping material itself having flexibility even though it is a 10-layer multilayered restraint type vibration damping material. The vibration damping material of the invention is suitable for use as a vibration damping material for ceilings, side walls, floors, etc. of various means of transportation such as automobiles, railway vehicles, aircrafts, ships, etc. It can be used in various advanced fields such as home appliances such as appliances, vacuum cleaners and washing machines.

Hereinafter, the present invention will be described in detail based on Examples and Comparative Examples, but the present invention is not limited by the Examples.

Example 1

A non-woven fabric having a thickness of 10 μm and a non-woven fabric having a thickness of 100 μm was prepared using a neoprene rubber polymer adhesive 2 to produce a sound absorbing and insulating sheet A composed of three layers, and between the two sound absorbing and insulating sheets produced in this way. Eight layers of composite, repeatable restraint prepared by inserting glass wool into a lattice pattern by inserting porous fibers (4) into a neoprene rubber polymer adhesive (2) to form vibration and noise scattering layers (B) 100 parts by weight of asphalt, 25 parts by weight of styrene-butadiene-styrene resin, 8 parts by weight of polybutene, 5 parts by weight of mica, 23 parts by weight of talc, 3 parts by weight of graphite and 7 parts by weight of aluminum powder were melted in a tank at 200 ° C. The vibration damping composition layer 5 manufactured by blending was formed, and the vibration damping material which has the polyethylene film 6 layer underneath was produced.

Example 2

The vibration damping material was manufactured by the method similar to Example 1, with the thickness of aluminum foil of 10 micrometers, and the nonwoven fabric 3 being 150 micrometers.

Example 3

The damping material was manufactured by the method similar to Example 1, making thickness of aluminum foil 10 micrometers, and thickness of the nonwoven fabric 3 200 micrometers.

Example 4

The damping material was manufactured by the method similar to Example 1, making thickness of 20 micrometers of aluminum foil, and thickness of 100 micrometers of nonwoven fabric 3.

Example 5

The damping material was manufactured by the method similar to Example 1, with the thickness of 20 micrometers of aluminum foil, and 150 micrometers of thickness of the nonwoven fabric 3. As shown in FIG.

Example 6

The vibration damping material was manufactured by the method similar to Example 1, with the thickness of 20 micrometers of aluminum foil, and 200 micrometers of thickness of the nonwoven fabric 3. As shown in FIG.

Example 7

The vibration damping material was manufactured by the method similar to Example 1, making thickness of aluminum foil 30 micrometers, and thickness of the nonwoven fabric 3 100 micrometers.

Example 8

The vibration damping material was manufactured by the method similar to Example 1, with the thickness of aluminum foil of 30 micrometers, and the nonwoven fabric 3 being 150 micrometers.

Example 9

The vibration damping material was manufactured by the method similar to Example 1, making thickness of aluminum foil 30 micrometers, and thickness of the nonwoven fabric 3 200 micrometers.

Example 10

A vibration damping material was prepared in the same manner as in Example 1, but the thickness of the aluminum foil was 10 μm and the thickness of the nonwoven fabric was 100 μm. Prepared.

Example 11

A vibration damping material was prepared in the same manner as in Example 1, but the thickness of the aluminum foil was 10 μm and the thickness of the nonwoven fabric was 150 μm. Prepared.

Example 12

A vibration damping material was prepared in the same manner as in Example 1, but the thickness of the aluminum foil was 10 μm and the thickness of the nonwoven fabric was 200 μm. Prepared.

Example 13

A vibration damper was manufactured in the same manner as in Example 1, but the thickness of the aluminum foil was 20 μm and the thickness of the nonwoven fabric was 100 μm. Prepared.

Example 14

A vibration damping material was prepared in the same manner as in Example 1, but the thickness of the aluminum foil was 20 µm and the thickness of the nonwoven fabric was 150 µm. Prepared.

Example 15

A vibration damper was manufactured in the same manner as in Example 1, but the thickness of the aluminum foil was 20 μm and the thickness of the nonwoven fabric was 200 μm. Prepared.

Example 16

A vibration damping material was prepared in the same manner as in Example 1, but the thickness of the aluminum foil was 30 μm and the thickness of the nonwoven fabric was 100 μm. Prepared.

Example 17

A vibration damper was manufactured in the same manner as in Example 1, but the thickness of the aluminum foil was 30 μm and the thickness of the nonwoven fabric was 150 μm. Prepared.

Example 18

A vibration damping material was manufactured in the same manner as in Example 1, but the thickness of the aluminum foil was 30 μm and the thickness of the nonwoven fabric was 200 μm. Prepared.

Example 19

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 10 μm and the thickness of the nonwoven fabric was 100 μm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. 3. (3) was prepared just above the vibration suppression composition layer (5).

Example 20

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 10 µm and the thickness of the nonwoven fabric was 150 µm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. (3) was prepared just above the vibration suppression composition layer (5).

Example 21

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 10 μm and the thickness of the nonwoven fabric was 200 μm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. 3. (3) was prepared just above the vibration suppression composition layer (5).

Example 22

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 20 µm and the thickness of the nonwoven fabric was 100 µm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. (3) was prepared just above the vibration suppression composition layer (5).

Example 23

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 20 µm and the thickness of the nonwoven fabric was 150 µm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. (3) was prepared just above the vibration suppression composition layer (5).

Example 24

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 20 µm and the thickness of the nonwoven fabric was 200 µm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. (3) was prepared just above the vibration suppression composition layer (5).

Example 25

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 30 μm and the thickness of the nonwoven fabric was 100 μm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. 3. (3) was prepared just above the vibration suppression composition layer (5).

Example 26

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 30 μm and the thickness of the nonwoven fabric was 150 μm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. 3. (3) was prepared just above the vibration suppression composition layer (5).

Example 27

A vibration damping material was prepared in the same manner as in Example 1, except that the thickness of the aluminum foil was 30 µm and the thickness of the nonwoven fabric was 200 µm, and the sound absorbing and insulating sheet A on the vibration damping composition layer 5 was absorbed as shown in FIG. (3) was prepared just above the vibration suppression composition layer (5).

Comparative Example 1

A vibration damping material was prepared by laminating only asphalt impregnation pads on the vibration damping composition layer 5 having the same formulation in Example 1.

Comparative Example 2

A vibration damping material was prepared by laminating only aluminium foil on the vibration damping composition layer 5 made of the same formulation in Example 1.

Comparative Example 3

The vibration damping material was manufactured by laminating only the nonwoven fabric on the vibration damping composition layer 5 which consists of the same formulation in Example 1.

[Comparative Example 4]

A vibration damping material was prepared by laminating only the polyvinyl chloride sheet on the vibration damping composition layer 5 made of the same formulation in Example 1.

[Comparative Example 5]

Only the urethane sheet was laminated on the vibration damping composition layer 5 which consists of the same formulation in Example 1, and the vibration damping material was manufactured.

[Measurement of loss factor and sound transmission loss]

The vibration damping material prepared according to Examples 1 to 27 and the vibration damping material prepared from Comparative Examples 1 to 5 were made 1.4 mm by adding the thicknesses of the vibration damping composition layer 5 and the polymer film layer 6. The thickness of each vibration damper was 6 mm with the restraint layer thickness equal to 6 mm, and the loss coefficient was measured according to KS F 2808 according to the measurement method of loss factor ASTM E75 G80. The results are shown in the table below. It was.

As can be seen from the above table, the loss coefficients of Examples 10, 11, 12, 19 and 20 in the low temperature region of 0 ° C to 10 ° C in the loss coefficient are the loss coefficients of Comparative Example 2. Although it was measured to be similar or slightly smaller than when compared with, the case of the embodiment shows a much better value than the comparative example at room temperature or above room temperature, even in the case of the acoustic loss at each frequency. At 125 Hz to 250 Hz, Example 1, Example 2, Example 10, Example 11, Example 12, Example 19, Example 20, Example 21, and Example 24 were similar to Comparative Example 1 and Comparative Example 2. It is shown that the result is, but the transmission loss is remarkably high in the band of 500Hz or higher, which is relatively high, and the overall result is excellent. Able to know.

Claims (5)

Metal foil (1) with excellent sound insulation performance in a compound type multilayer vibration damping agent which is flexible and absorbs and blocks vibration and noise and has excellent sound insulation and vibration damping performance in all frequency bands, nonwoven fabric, fiber felt, and chemicals. The three-layered sound absorbing and insulating sheet (A) was fabricated by compounding with a polymer adhesive (2) to help improve vibration damping between the sound absorbing layer (3) having a high porosity selected from pulp paper. Two or more sound insulating sheets (A) are laminated, and between the stacked sound absorbing and insulating sheets (A), a high strength porous fiber layer (4) selected from carbon fibers, glass fibers, polyester fibers, and the like, natural rubber, acrylic, chloride Double layered through the vibration and noise scattering layer (B), which is a composite of a polymer adhesive layer (2) selected from rubber, and at the bottom is asphalt and mica, clay, talc, graphite, silica, zinc oxide and the like. A vibration damping layer (C) comprising a vibration damping composition layer (5) consisting of a vibration damping composition consisting of a polymer resin and a metal powder selected from styrene-butadiene-styrene and ethylene vinyl acetate, and a polyethylene film. Multilayer composite vibration damping material, characterized in that laminated. The multi-layer vibration damper is laminated in the order of the absorbing and insulating sheet (A), the vibration and noise scattering layer (B), the absorbing and insulating sheet (A), and the damping layer (C). Multilayer composite vibration damper. 2. The multilayer composite vibration damper according to claim 1, wherein the metal foil (1) of the sound absorbing and insulating sheet (A) is selected from aluminum foil, copper foil, and lead foil, and has a thickness of 8 µm to 30 µm. The multi-layer composite vibration damper according to claim 1, wherein the thickness of the sound absorbing layer (3) having a high porosity selected from nonwoven fabrics, fiber felts, and chemical pulp paper is 100 µm to 200 µm. The vibration damping composition layer (5) of the vibration damping layer (C) is characterized in that the polymer resin is 10-30 parts by weight, 30-200 parts by weight of the damping filler, 10-30 parts by weight of the metal powder based on 100 parts by weight of asphalt. Multilayer composite vibration damper, characterized in that configured.