JPS629948A - Sound-absorbing material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a sound absorbing material, particularly to a sound absorbing material that maximizes its sound absorbing effect and has excellent mechanical strength.

(Prior Art) In recent years, industrial noise such as traffic noise, factories, and IGT power generation has become one of the most common social problems.

Conventionally, as a means to prevent such noise, a metal case with a gaffle and a sound-absorbing material such as glass has been used to prevent dust and inorganic water. Proposition 4i using hard porous t4 has also been partially made.

(Problems to be Solved by the Invention) However, among these means of detention, the soundproofing properties of the gun school are often seriously inhibited by the force of rain water, and it is also difficult to use a PC metal case because it is not self-sustaining. However, the retaining material may sometimes act as a sound resonator, so it has the disadvantage that it is difficult to be satisfied as a soundproofing material.

The latter method, for example, is represented by light II aerated concrete, which has an excellent 7tr! Although it has the 'f characteristic, it is itself brittle and easily chipped, so it has usually been proposed to provide a strength-retaining material on its surface.

However, in many cases, the six-sided RC reinforcing material for sold concrete is directly glued on all sides, resulting in a state that is almost as if the blush has been crushed, which considerably impedes the material absorption properties of the concrete. However, there was one drawback.

(Means for Solving All Problems) The present invention has been made to solve the above-mentioned problems, and it provides excellent fc characteristics of the inorganic hydraulic porous material without substantially impairing the rc characteristics. With the aim of discovering a structure in which a reinforcing material is provided on the blush surface, Kenbon Yuzu studied Yume and Kogo 7, and made the hard porous material blush fully in contact with a hard hammer with air permeability. It has been found that the first objective can be achieved by discontinuously bonding and supporting the materials, and the gist of the present invention is based on this finding.

The inorganic hydraulic porous material 1 used in the present invention has an air permeability of 0.5 to 50-7 seconds/1111 Hg, so that it can effectively absorb sound by averaging a wide frequency range. It is preferable because it can be obtained. In the present invention, the air permeability is defined as the air permeability of 1 d and 1 m of sound absorbing H having 1 m Hg of compressed air applied to one pile, and 1 i of air coming out from the opposite side in 1 second.
(hang/second) tS-U.

The material has an average pore size of 0.2 to 1.51 u.
By adopting @Xing, the above-mentioned sound absorption advantage can be made even more reliable.

As such materials, inorganic 7X hard materials such as stone silicate and calcium silicate are generally used, and by using lightweight cellular concrete in particular, remarkable effects can be expected.

Next, the air permeable hard material used in the present invention should have an air permeability of about 02 to 1.27/sec/sllBg, so as not to impede the sound absorption properties of the inorganic hydraulic porous material. Since this scatters all of the noise light and weakens the intensity of the sound, it can be expected that the effect of increasing the apparent f absorption percentage can be expected. In fact, the thickness of the apparent material with such physical properties is 5~1Qwam, and the thickness of the pressure shoe is 120~120~
It has been found that when a 250 kg/- hard material is used, the apparent sound absorption coefficient of the inorganic hydraulic porous 4117) increases by about 10-3 () times.

For example, such actual materials have an average particle size of 0.5 to 3.
Brick or granite rock powder with m is molded to have air permeability as mentioned above by using a glass frit type binder, or Kanatou ware which has air permeability. The result is t* etc.

Thus, a hard side is provided on the surface of the inorganic hydraulic porous material, but in the present invention, for example, both are formed into a plate-like body and are brought into full contact with each other, but they are not joined completely as is. The material is discontinuously bonded and supported. jl
1), the two plate-like bodies are kM-kneaded together (thus, the mating metal plates m1 are brought into contact with each other, but they are bonded to each other b-like at a point).

Such bonding is performed on the inorganic hydroxyl porous material surface 10-100-
If one point is used for each joint, and the area per joint is about 1 to 554, the apparent sound absorption coefficient of the inorganic hydraulic porous material will increase by about 10 to 30 percent, as mentioned in Af4. At the same time, it is possible to bond the two with sufficient mechanical strength.

There is no particular restriction on the middle part of the joint between the two,
For example, any known means such as suitable adhesives or bolts may be used.

For the porous electric material and the hard material, the latter can be provided on one side of M++ moss (-< is on both sides, and it is also possible to apply a suitable frame gold film around them from the rcF9T VC.

Claims (1)

[Claims] 1. A sound absorbing material in which a hard material having air permeability is brought into full contact with the surface of an inorganic hydraulic porous material, and these are discontinuously bonded and supported. 2. The inorganic hydraulic porous material has an air permeability of 0.5 to 5.0c.
The sound-absorbing material according to claim (1), which has a sound absorption value of m^2/sec/mmHg. 3. The inorganic hydraulic porous material has an average pore diameter of 0.2 to 1.
The sound absorbing material according to claim (1) or (2), which has a thickness of 5 mm. 4. The sound absorbing material according to claim (1), (2) or (3), wherein the inorganic hydraulic porous material is lightweight cellular concrete. 5. The air permeable hard material has an air permeability of 0.2 to 1.2.
The sound absorbing material according to claim (1), which has a sound absorption of cm^2/sec/mmHg. 6. The hard material with air permeability has an average particle size of 0.5 to 3 mm.
Claim (1), which is made by molding crushed bricks or rocks with a binder so as to have air permeability.
Or (5) sound absorbing material. 7. The sound absorbing material according to claim (1) or (5), wherein the breathable hard material is a sintered metal body. 8. Discontinuous bonding support is the inorganic hydraulic porous material surface 1
The sound absorbing material according to claim (1), which has a ratio of one location per 0 to 100 cm^2. 9. The area of each discontinuous joint support part is 1 to 5 cm.
The sound absorbing material according to claim (1) or (8), which is m^2.