JP3291678B2 - NOx purification sound absorbing member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to the, NO relates _X purifying sound absorbing member, more particularly NO _X with sound absorbing effect and NO _X purification effect excellent in a simple structure remembering NO _X purification action by the sound absorbing material simultaneously The present invention relates to a sound absorbing member for purification.

[0002]

Pollution Recently, automobile, air quality by NO _X contained in particular in the exhaust gas exiting from diesel vehicles is increasing with increasing number of automobiles, traffic congestion or the like associated therewith. Conventionally, metal oxides have been known as substances that reduce the concentration of NO _X , and among them, titanium dioxide is also known to have a strong photocatalytic action. By utilizing such strong photocatalytic action of titanium dioxide, NO _x
Removing the study recently by mixing titanium dioxide becomes increasingly popular to form a sheet or panel, removing the NO _X with the outer wall of the building is being put into practical use.

[0003]

Under these circumstances, in addition to the case where the sheet or panel as described above is used as a conventional building material (for example, an exterior wall), specific methods for applying the sheet or panel to various places have been studied. It is getting. Therefore, the present inventors have conducted various studies from such a viewpoint, and as a result, by applying a kneaded material containing cement, titanium dioxide powder and a specific fine aggregate to the sound absorbing material, an excellent sound absorbing effect with a simple structure is obtained. NO _X
Found that NO _X purifying sound absorbing member having cleaning effect at the same time can be obtained, leading to completion of the present invention herein.

[0004] Accordingly, a first object of the present invention is to provide is to provide a NO _X purifying sound absorbing member at the same time having excellent sound absorbing effect and NO _X purification effect with a simple structure. A second object of the present invention is to provide a NO _X purification sound absorbing member having both an excellent sound absorption effect and a NO _X purification effect without damaging the existing surrounding environment. A third object to be solved by the present invention is to provide a NO _x purification sound absorbing member that is easy to enter light and easy to clean.

[0005]

The above objects of the present invention are attained by the following inventions.

[0006] (1) In the sound-absorbing base material, there are
A sound absorbing member having a lightweight aggregate for
100 parts by weight of cement, 5 parts by weight to 50 parts by weight of titanium oxide powder, and particle size of 1 mm to 15 mm on lightweight aggregate for reeds
50 parts by weight of fine aggregate having an average particle size selected from
NO _X purifying sound absorbing member characterized by having a NOx purification layer comprising a kneaded product comprising 00 parts by weight. (2) fine aggregate is sand, lightweight aggregate, NO _X purifying sound absorbing member according to the paragraph 1, wherein at least one selected from glass particles or silica sand. (3) The porosity of the NOx purification layer obtained from the kneaded material is 10
The first term or NO _X purifying sound absorbing member according to paragraph 2, wherein the at least%.

[0007]

When DETAILED DESCRIPTION OF THE INVENTION further illustrate the present invention below, NO _X purifying sound absorbing member of the present invention, in the sound-absorbing base material
To sound-absorbing members with lightweight aggregate for glazed concrete
100 parts by weight of cement, 5 to 50 parts by weight of titanium oxide powder and 50 to 400 parts by weight of fine aggregate having an average particle diameter selected from particle diameters of 1 to 15 mm. It is characterized by having a NOx purifying layer made of a kneaded material containing a weight part, thereby providing an excellent sound absorbing effect and NO with a simple structure (without complicating the structure of the sound absorbing material) without changing the existing environment. It has an excellent effect that the _X purification effect can be exhibited at the same time. In the present invention, the fine aggregate has a particle size of 1
When a material having an average particle size selected from mm to 15 mm is used and the porosity is 10% or more, an excellent sound absorbing member is obtained, whereby light easily enters, and generated nitrate ions and the like are removed. It has an excellent effect of being easily washed. Particularly fine aggregate, glass particles, in the case of using the lightweight aggregates and silica sand, it is possible to absorb more solar, NO _X
Great removal effect.

In the present invention, the sound-absorbing material or the sound-absorbing substrate may be any of those generally used in the technical field of the sound-absorbing material or the sound-absorbing substrate. These surfaces, although NO _X purifying kneaded product is provided, the thickness of the kneaded mixture layer 15mm~2
mm, preferably 10 mm to 2 mm, and more preferably 8 mm to 3 mm. In the present invention, when the thickness of the kneaded product exceeds 15 mm, sunlight hardly permeates, and the titanium layer is wasted. The thickness thereof is poor durability with purification efficiency of the NO _X becomes poor less than 2 mm.
When the kneaded material is provided on the perforated plate, a coating may be provided on the entire surface so as to cover the holes, but it is preferable to cover the holes so as not to seal them. Further, the thickness of the dust concrete layer may be the thickness of the dust concrete layer usually used for a sound absorbing material, and is not particularly limited.

The sound-absorbing member used in the present invention is manufactured by filling a light-weight aggregate with light-blown concrete, and the light-weight aggregate is usually a light-weight light aggregate for light-diffused concrete, and may be either natural or artificial. Natural lightweight aggregates are preferably pumice stones, and artificial lightweight aggregates are preferably those having a porous structure of open cells. By using these, extremely excellent sound absorbing properties can be obtained. In the present invention, N
By pouring the O _X purifying kneaded product, sound absorbing effect and N
O _X purification effect can be obtained simultaneously. Methods for making this artificial lightweight aggregate are well known in the art.

[0010] In the present invention, the fine aggregate to be used in the NO _X purifying kneaded product, sand, glass, lightweight aggregates, but quartz sand or the like is used, in the case of using sand, having high light transmittance glass By adding particles and silica sand, sufficient light penetrates deeply to improve NO _X purification efficiency. In the present invention, the fine aggregate has an average particle diameter selected from 1 mm to 15 mm, particularly preferably 1 mm to 10 mm, and more preferably 1 mm to 7 mm. The smaller the particle size of the fine aggregate, the better the sound absorbing effect. However, if the particle size is smaller than 1 mm, a practical sound absorbing effect cannot be obtained. Even if the particle size exceeds 15 mm, the sound absorbing effect is reduced. The thickness of the NO _X purifying kneaded product is 15mm~2mm like the perforated plate as described above, preferably 10Mm～2mm, more preferably 8mm~3m
m. Also on the surface of the cleaning kneaded product layer, positively can form an uneven, thereby making it possible to promote the absorption of light and NO _X. The addition ratio of fine aggregate is 50 parts by weight of fine aggregate to 400 parts by weight with respect to 100 parts by weight of cement.
However, if the fine aggregate exceeds 400 parts by weight, the amount of titanium oxide is relatively reduced, so that the NO _x purification efficiency is inferior.

The proportion of titanium oxide in the kneaded product used in the present invention varies depending on the type and particle size of titanium oxide, but titanium oxide powder is added to 100 parts by weight of cement.
The amount is from 50 to 50 parts by weight, preferably from 10 to 50 parts by weight of titanium oxide powder. More preferably, the amount is 20 to 50 parts by weight of titanium oxide powder. If the content of the titanium oxide powder is less than 5 parts by weight with respect to 100 parts by weight of the cement, NO
The purification efficiency of _X is not good, and if it exceeds 50 parts by weight, the strength decreases. Sand, inferior purifying efficiency in the titanium oxide powder is reduced NO _X amount exceeds 400 parts by weight. In the present invention, the preferred component ratio of the kneaded product is cement 10
10 parts by weight to 50 parts by weight, more preferably 20 parts by weight to 50 parts by weight, and 5 parts by weight of sand
0 to 300 parts by weight.

Fibers may be added to the kneaded material used in the present invention, and the fibers are not particularly limited. Examples of the fibers include wollastonite, asbestos, E glass fiber, and alkali-resistant fiber. Inorganic fibers such as glass fiber, stainless steel fiber, etc .; natural organic fibers or synthetic fibers such as pulp; more specifically, natural organic fibers such as NBK pulp, LBK pulp, cotton pulp, pulp such as hemp pulp, Wood flour, sawdust, cork flour, various fibers and the like can be mentioned, and synthetic fibers include vinyl chloride, polypropylene, nylon, polyamide, polyester, polyurethane, vinylon, polyethylene, aramid fiber, carbon fiber and the like. These fibers are 10 or less, preferably 1 mm to
It is good to have a length of 10 mm, more preferably 2 mm to 10 mm
The length is good. The fiber diameter is 0.001m
m to 2 mm is preferred. The amount of the fiber used in the present invention is from 0.1 to 5.0 parts by weight, preferably from 1.0 to 4.0 parts by weight. If the amount of the fiber is less than 0.1 part by weight, the adhesion is weak, and if it exceeds 5.0 parts by weight, the voids are increased and the strength is reduced.

An organic substance such as a resin may be added to the kneaded product used in the present invention. The resin is not particularly limited, but may be a rubber latex, a resin emulsion, or an aqueous polymer dispersion. Methylcellulose, PVA, re-emulsifiable powder resin can be used as a viscosity agent, and polyester resin, epoxy resin, polyurethane resin and the like can be used as a liquid polymer. The addition of these resins has effects such as an increase in strength and an increase in durability. The amount of the resin used in the present invention is 0.2
% To 50% by weight. If the resin content is less than 0.2% by weight, there is substantially no effect of increasing the strength, and if it exceeds 50% by weight, the strength is rather reduced. Further, a coloring effect may be obtained by adding a coloring pigment to the kneaded product of the present invention, and as the coloring pigment, an inorganic pigment is preferable, and red iron, nickel titani yellow, ultramarine, navy blue, cobalt blue, carbon black, cobalt green, and the like are preferable. No. The added amount of the coloring pigment used in the present invention is 0.2 to 20 parts by weight, and an excellent coloring effect is exhibited in this range.

[0014] In (act) present invention, it is possible to express the purification effect of the NO _X without impairing the sound absorption effect by having a kneaded product onto the surface of the perforated plate Yamabushi concrete layer. The glass, because good optical transparency can be obtained by using silica sand, can be promoted purifying effect of NO _X. Furthermore, the surface side of the sound absorbing material is made of lightweight aggregate and N
O _X by having a surface layer composed of purifying kneaded product easily contact area of the air enters the larger light, and because it is easy to enter the rainwater, fast washing with them. In addition, the sound absorbing effect and NO _X can be easily achieved without damaging the basic structure of the existing sound absorbing material.
The purification effect can be obtained, and the economic efficiency can be improved.

[0015]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

[0016] Example 1 FIG. 1 is a sectional view showing the NO _X purifying sound absorbing member of the present invention. As shown in FIG. 1, 100 parts by weight of cement and perlite (1.5 mm to 2.2 m in diameter) were placed in an extruded concrete sound absorbing substrate 1 a.
m) After kneading 140 parts by weight and 45 parts by weight of water,
The pearlite layer 2 was formed by pouring to a thickness of 2 mm. Further, 80 parts by weight of cement, 20 parts by weight of titanium oxide, 140 parts by weight of pearlite having the above particle size,
Knead 5 parts by weight, pour it to a thickness of 15 mm and mix NO _x
The purification layer 3 was formed. Next, the kneaded filler of each of these layers was cured and cured to obtain the NO _x purification sound absorbing member 10. When the sound absorption coefficient of this NO _X purification sound absorption member 10 due to normal incidence was measured, the average sound absorption coefficient was 0.62.
(125-2000 Hz), which is sufficient sound absorbing performance. A 20 cm ² fragment of the sound absorbing member 10 was placed in a container, irradiated with an ultraviolet lamp, and air containing 1 ppm of NO gas was flowed at 11 / min. NO _X gas concentration of 24-hour average air outlet is 0.08 ppm, excellent NO
_{It had X} gas purification ability. In addition, 7 is a resonator part.

[0017] EXAMPLE 2 FIG. 2 is a sectional view showing another embodiment of the NO _X purifying sound absorbing member of the present invention. FIG.
2. A NO _X purification sound absorbing member 11 was manufactured in the same manner as in Example 1 except that an iron plate sound absorbing base 1b having a shape as shown in FIG. 2 was used instead of the sound absorbing base 1a shown in FIG. did. When the sound absorption coefficient at normal incidence was measured in the same manner as in Example 1, the average sound absorption coefficient was 0.59 (125 to 2000H).
z), which is sufficient sound absorbing performance.

[0018]

Example 3 The kneaded material of the NO _X purification layer 3 described in Example 1 was used as fine aggregate as crushed stone (particle size: 2.2 mm or more).
3.2 mm), 75 parts by weight of cement, -titanium oxide 25
A kneaded material of 50 parts by weight of water and 50 parts by weight of water was used as a binder, and was blended in a ratio shown in Table 1 with respect to 100 parts by weight of crushed stone. The obtained porosity, NO _X removal rate, and sound absorption rate were measured. Table 1 shows the obtained results.

[0020]

[Table 1] Incidentally, NO _X removal rate, in a container was irradiated with ultraviolet rays 20
Place the sample cm ^2, and was measured by flowing air of the NO _X concentration 1 ppm, the ratio of the NO _X concentration in the inlet and outlet.

[0021]

The sound absorbing member for purifying NO _{X of the} present invention uses a fine aggregate having an average particle diameter selected from a particle diameter of 1 mm to 15 mm, so that NO _X can be reduced without impairing the sound absorbing effect.
Can exhibit a sufficient purifying effect. The easily enter large light contact area of the air by having a surface layer surface side of the sound absorbing material is made of NO _X purifying kneaded product having a porosity of 10% or more, and because it is easy to enter the rainwater, washing with them early. Also can easily obtain the cleaning effect of the sound absorbing effect and NO _X, mention may be made of economic efficiency. Further glass, so excellent optical transparency can be obtained by using silica sand, it can be promoted purifying effect of NO _X.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a NO _X purification sound absorbing member of the present invention.

FIG. 2 is a sectional view showing another embodiment of the NO _X purification sound absorbing member of the present invention.

[Explanation of symbols]

1a, 1b sound-absorbing base material 2 aggregate layer (perlite) 3 NO _X purification layer 4 Aggregate 5 cement 6 titanium oxide particles 7 resonator portion 10, 11 N O _X purifying sound absorbing member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI E04B 1/92 E04B 1/92 // C04B 111: 52 C04B 111: 52 (72) Inventor Koji Obata Kichibukurocho, Omiya City, Saitama Prefecture 297-chome, Mitsubishi Materials Corporation Cement Research Institute (56) References JP-A-7-215778 (JP, A) JP-A-7-171408 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/82 C04B 14/30 ZAB C04B 20/00 C04B 28/02 C04B 38/08 E04B 1/92 C04B 111: 52

Claims (3)

(57) [Claims] (1) Light-weighted concrete for covering concrete in a sound-absorbing substrate.
The sound absorbing member having an aggregate,
Mixture containing 100 parts by weight of cement, 50 parts by weight to 50 parts by weight of titanium oxide powder and 50 parts by weight to 400 parts by weight of fine aggregate having an average particle diameter selected from particle diameters of 1 mm to 15 mm on a lightweight aggregate for use . NO _X purifying sound absorbing member characterized by having a NOx purification layer made of. 2. A fine aggregate is sand, lightweight aggregate, NO _X purifying sound absorbing member according to claim 1, characterized in that at least one selected from glass particles or silica sand. 3. NO _X purifying sound absorbing member according to claim 1 or claim 2 porosity of NOx purification layer obtained from the kneaded material is characterized in that 10% or more.