JPH0663286B2 - Soundproof composite damping material for building materials - Google Patents

Description

TECHNICAL FIELD The present invention relates to a composite vibration damping material that prevents solid sound from propagating to a building material such as a wall board, a ceiling board, or a floor board due to impact.

[Prior art and its problems]

The following publicly known examples can be given as soundproof building materials for preventing the propagation of solid sound due to impact on building materials.

(a) Japanese Utility Model Publication No. 50-49917: The floor material of this known example has a foaming ratio of 3 to 10 on the back surface of the floor material body.
Double soft high foam layer and foaming ratio of 1.5 for embossing
It is formed by sequentially laminating soft low-foam layers of less than 3 times.

(b) No. 61-47339: This known sound-insulating wood flooring has a sound-insulating foam consisting of a plurality of layers attached to the entire lower surface of a wooden board, and the foaming ratios of adjacent upper and lower layers are mutually exclusive. It is different from.

And, in a composite of foams having different expansion ratios as in these known examples, it is a cushioning material having low rigidity, and when an impact force is immediately received by the cushioning effect, while the foam is deformed, Even if the impact time becomes long and the momentum changes, that is, the temporal integration value of impulse and impact force are constant, the peak value of impact force and the impact natural frequency are reduced, and the impact input energy to the substrate is reduced. The sound and vibration caused by the impact are both reduced.

When these cushioning materials are compounded on the back surface of the building material, the shock absorbing effect absorbs energy by the expansion and contraction deformation of the cushioning material caused by the bending vibration of the building material.

However, the influence of the thickness ratio of the building material and the cushioning material is high,
It is necessary to make the thickness ratio 2 to 3 times, the cushioning material becomes too thick, the bending of the building material itself is severe, and the connection part of the building material is damaged. There is a problem that it causes.

[Means for solving the problem and its action]

The present invention is one in which a composite damping material having the following constitution is laminated on a building material in order to solve the problems of the conventional soundproof building material as described above.

That is, the composite damping material of the present invention has a compressive Young's modulus of 50.
The plate-shaped restraint member 4 of 0 to 150,000 Kg / cm ² is used as a core, and the damping Young's modulus 5 having a compressive Young's modulus of 10 to 1000 Kg / cm ² is provided on one side, and the compressive Young's modulus is 0.05 to 50 Kg / cm on the other side. The cushioning material 6 of ² is stuck and laminated.

Since the soundproof composite vibration damping material of the present invention has the above-mentioned structure, the vibration damping material 5 and the plate-shaped restraining material 4 absorb a shock and its vibration energy with a relatively thin thickness, and the shock energy by the shock absorbing material 6 is absorbed. It has a synergistic effect of absorbing, and by stacking this on a building material, the soundproofing effect of the building material is remarkably improved.

[Explanation of Examples]

Hereinafter, examples in which the composite damping material of the present invention is used for a floor plate will be described.

In the drawings, reference numeral 1 is a floor board body, and a plate-like body such as plywood, fiber board, and particle board is used as a substrate, and pattern printing, veneer sticking, synthetic resin or synthetic resin foam decorative sheet sticking, decorative paper or An arbitrary make-up such as synthetic resin impregnated decorative paper is applied, and the upper edge is 2 on the two sides in the width and length directions orthogonal to the four edges of the wood, and the width and length directions orthogonal to the other wood edges. The bottom 3 is formed on the two sides of.

On the back side of the floorboard main body 1, a plate-like restraint member 4 made of a plate-like body such as plywood, fiberboard, paperboard, particle board, synthetic resin plate, metal plate, concrete plate, etc. is used as a core material, and one side thereof is made of rubber-based material. , Synthetic resin, foamed synthetic resin type, asphalt type sheet, lead powder (sound-insulating) iron oxide mixed with heavier substances with specific gravity of 4 or more. Of the same size as the width and length of the floorboard main body 1 to which the cushioning material 6 made of a sheet material such as rubber-based, synthetic resin or foamed synthetic resin-based, and asphalt-based material is attached on the other surface. The composite damping material 7 is laminated.

When a foamed synthetic resin sheet material is used, it is preferable that the internal bubbles have a perfect circular shape. This is because the true circular shape has the highest resistance to compression.

Then, so that the surface of the vibration damping material 5 of the composite vibration damping material 7 contacts
In addition, the floorboard body 1 is fixed so as to jut out by an appropriate width on the upper side 2 formed in the width and length directions, and the fitting groove 8 is formed to obtain a soundproof flooring.

The plate-like restraining member 4 is a plate-like member as described above, and has a compression Young's modulus of rigidity of 500 to 150.000 kg / cm ² or more. The vibration damping member 5 is a sheet-like member as described above. And the compressive Young's modulus is preferably 10 to 1000 kg / cm ² .

Since the composite damping material 7 laminated on the floorboard body 1 is provided with a viscoelastic damping material between the plate-shaped restraining material 4 having high rigidity and the floorboard body 1, it is possible to reduce the impact force applied to the floorboard body 1. The expansion and contraction due to bending vibration is constrained by the plate-shaped constraining member 4 on the back surface side of the damping material 5, so that the damping material layer undergoes shear deformation. The applied impact force and vibration energy are absorbed.

Further, since the cushioning material 6 having elasticity is provided on the back surface side of the plate-like restraining material 4 having high rigidity, the impact force reduced and propagated by the vibration damping material 5 and the plate-like restraining material 4 is further absorbed. It is absorbed by the elastic deformation of 6. Therefore, in combination with the absorption of the impact force and the vibration energy by the plate-shaped restraining member 4 and the vibration damping member 5, the soundproof effect against solid sound becomes excellent.

As described above, the damping material 5 expands and contracts due to bending vibration due to the impact force of the floorboard body 1 from the front surface side, and is restrained by the plate-shaped restraining material 4 on the back surface side. Shear deformation occurs in the, and this shear deformation absorbs energy. Therefore, if the compressive Young's modulus is 10 kg / cm ² or less, the shearing deformation of the damping material 5 due to the expansion and contraction of the floorboard body 1 is large, and the restraint force of the plate-like restraint material 4 almost restrains the expansion and contraction of the floorboard body 1. Instead, the floorboard body 1 will expand and contract independently,
It is difficult to absorb energy. On the contrary, the damping material 5
If the Young's modulus of compression is 1000 kg / cm ² or more, the restraining force due to the expansion and contraction of the floor plate body 1 remains unchanged.
Therefore, the floor plate body 1 and the plate-like restraint member 4 integrally expand and contract, and energy cannot be absorbed.

The cushioning material 6 absorbs the propagating impact force by the expansion and contraction deformation of itself, and if the compressive Young's modulus is 0.05 Kg / cm ² or less, the expansion and contraction can be facilitated, but the impact is absorbed. To absorb energy, the thickness must be increased, and conversely, the compressive Young's modulus is 50 kg / c.
If it is m ² or more, the rigidity becomes high, the expansion and contraction deformation is small, and the energy cannot be absorbed sufficiently.

For reference, the solid sound prevention material will be described.

Solid sound prevention material (A) Anti-plate material A material that prevents the propagation of vibrations by mainly reflecting it, and often adds a mass element that originally exists in the normal propagation system. (B) Damping material that absorbs shock energy, that is, by converting it to thermal energy, suppresses resonance amplification of the natural vibration system, increases the distance attenuation of vibration propagation, diffuses vibration plates, etc. It is a material that prevents the accumulation of energy.

(1) Centralized damping material A typical example is a resistance type damper used in parallel or in series with a spring material in a natural vibration system composed of a mass and a spring.

(2) Distributed damping material In general, a sheet of viscoelastic material with large internal loss is used by adhering it to one side of the vibration-damped base material or in the middle of the base material. In some cases, the air flow resistance of a sound absorbing material is used. Both of them dampen the bending vibration of the plate in the mid-high range.

(3) General characteristics of damping material Most rubber-based, plastic-based, and asphalt-based compound materials are used, and all of them utilize viscoelasticity near the glass transition point.

It is important that the damping material have sufficient loss above all else, but in order to bear the force and obtain a large energy loss, it must have an appropriate Young's modulus for the base material side. It is also important.

(4) Non-restraint type damping material A damping material that is usually used in close contact with one side of the board with an appropriate thickness to absorb energy by expansion and contraction deformation caused by bending vibration of the board.

The vibration control characteristic has a high contribution of the thickness ratio, but has a saturation characteristic for a constant Young's modulus ratio. For example, when the Young's modulus is 1/10, the thickness ratio is 1/2 times 1/100. 1.5 times, 1/1
If 000 is set to about 5 times, the loss factor ratio will be about 0.4 times, which enables efficient use of damping material.

Usually, a material has been developed according to the material of the base material so that the loss factor of the composite plate becomes efficient when the thickness ratio is increased by a factor of 2 to 3, and is about 0.05 to 0.2.

A point to be noted in use is to first select a material that matches the Young's modulus of the substrate, determine an appropriate thickness ratio, and bond the substrate sufficiently strongly.

It is meaningless even if a damping material having a high Young's modulus is adhered with a soft rubber glue or the like because the rubber layer is displaced and deformed and a sufficient force is not transmitted to the damping material.

(5) Restraint type damping material In order to restrain the expansion and contraction due to bending vibration of the board on the opposite side with a damping material in which a viscoelastic layer is adhered to one side of the board and a constraint layer with a high Young's modulus is provided on the surface The energy is absorbed by the shear deformation generated in the viscoelastic layer.

The damping characteristics are determined by the elastic coefficient and thickness of each layer and the loss coefficient of the viscoelastic layer, and some assumptions (the Young's modulus of the damping material is small, the overall bending rigidity is determined by the substrate and the restraint, The thickness of the restraint material is thin and the thickness of the damping material remains the same).

It is a natural result that the closer the compressive rigidity of the constraining layer to the substrate is, the larger the overall loss coefficient is because the shear deformation of the viscoelastic material is larger. The difference is that the thickness of the viscoelastic material is almost irrelevant, and sufficient performance is obtained even at 0.1 mm or less.

FIG. 3 schematically illustrates the classification of use conditions of the vibration damping material, where 1 is a substrate, 2 is a vibration damping material, and 3 is a restraining material.

〔effect〕

INDUSTRIAL APPLICABILITY The soundproofing composite vibration damping material of the present invention is effective in absorbing sound and vibrational energy by the vibration damping material and the plate-like constraining material, and by absorbing shock energy by the cushioning material, and when it is laminated on a building material, its soundproofing effect is remarkable. Improve significantly.

[Brief description of drawings]

 FIG. 1: Cross-sectional view of the soundproofing material of the present invention, FIG. 2: Same perspective view thereof, FIG. 3: Explanatory drawing of use condition classification of damping material, 1 ... Building material, 5 ... Damping material, 2 ... … Upper solid, 6 …… Cushioning material, 3 …… Lower solid, 7 …… Composite damping material 4 …… Plate restraint material, 8 …… Mating groove.

Claims (1)

[Claims] 1. A compressive Young's modulus of 500 to 150,000 Kg / c
a plate-like restraint member 4 m ² as a core, the damping material 5 compression Young's modulus of 10~1000Kg / cm ² on one surface thereof, cushioning material of the compression Young's modulus is 0.05~50Kg / cm ² on the other side 6. A soundproof composite vibration damping material for building materials, which is obtained by laminating and stacking 6.